‘A thoroughly unhousewifely skill’

HodgkinBust etc 009

For International Women’s Day, the Museum of Natural History celebrates the life and career of Dorothy Hodgkin, one of its most eminent researchers. Hodgkin was awarded the Nobel Prize for Chemistry in 1964, and is still the only UK woman to have been awarded one of the science Nobels.

When the Museum of Natural History was designed in the 1850s, the building was intended not just to house a museum but also the burgeoning science departments of the University. The lettering above the doors facing the court continues to record these early affiliations: ‘Department of Medicine’, ‘Professor of Experimental Philosophy’, and so on.

Dorothy_Hodgkin_Nobel
Dorothy Mary Hodgkin (1910–1994) Image: Nobel Prize

As individual departments grew they moved into their own buildings across the science campus. One of the last research groups left in the Museum was the Department of Mineralogy & Crystallography, which, from the 1930s onwards, was the research home of the outstanding X-ray crystallographer Dorothy Hodgkin (1910-1994), winner of the Nobel Prize for Chemistry in 1964.

The Daily Mail famously celebrated her success with the headline ‘Oxford housewife wins Nobel’, but The Observer was no more enlightened, commenting that Hodgkin was ‘an affable looking housewife’ who had been awarded the Nobel Prize for ‘a thoroughly unhousewifely skill’.  That socially disruptive ability was an unparalleled proficiency with X-ray analysis, particularly in the elucidation of the structure of biological molecules.

Hodgkin undertook her first degree at Oxford from 1928 to 1932, initially combining chemistry and archaeology but later focusing on the emerging technique of X-ray crystallography. Her undergraduate research project was carried out using this technique in a Museum laboratory within what is now the Huxley Room, the scene of the 1860 Great Debate on evolution between Bishop Wilberforce and T. H. Huxley. She then journeyed across to Cambridge for her PhD before returning to Oxford in 1934 and resuming her association with the Museum.

Model_of_the_Structure_of_Penicillin,_by_Dorothy_Hodgkin,_Oxford,_c.1945
Model of the Structure of Penicillin, by Dorothy Hodgkin, Oxford, c.1945, in the Museum of the History of Science

Back in Oxford, Hodgkin started fundraising for X-ray apparatus to explore the molecular structure of biologically interesting molecules. One of the first to attract her attention was insulin, the structure of which took over 30 years to resolve – a project timescale unlikely to appeal to modern research funders. Other molecules proved more tractable, including the newly discovered penicillin, which Hodgkin began to work on during the Second World War, and vitamin B12.  It was for the determination of these structures that she was awarded the Nobel Prize.

Dorothy Hodgkin’s new X-ray laboratory was set up in a semi-basement room in the north-west corner of the Museum.  The room is now a vertebrate store but was once also the research home of Prince Fumihito of Japan, when he was based in the Museum for his ichthyological research (and It is still the only room in the Museum with bulletproof windows).

Initially, Hodgkin’s only office space consisted of a table in this room and a small mezzanine gallery above, which housed her microscopes for specimen preparation. Once prepared, she then had to descend a steep, rail-less ladder holding the delicate sample to the X-ray equipment below. Later, Hodgkin had a desk in the ‘calculating room’ (now housing the public engagement team) where three researchers and all of their students sat and undertook by hand the complex mathematics necessary after each analysis to determine the crystal structures of organic molecules.

Paul Smith – Director

If you would like to learn more about Dorothy Hodgkin and her work, then read Georgina Ferry’s excellent biography ‘Dorothy Hodgkin: A Life’ which has just been re-issued as an e-book and new, print-on-demand paperback by Bloomsbury Reader.

 This year’s Dorothy Hodgkin Memorial Lecture will be held in the Museum at 5 pm on Thursday 12 March, and is open to all. The lecture will be given by Dr Petra Fromme (Arizona State University) who is an international authority on the structure of membrane proteins.

The finest fossils

Collecting fossils%2c near Fuxian Lake%2c Chengjiangjpg One of the most remarkable fossil sites in the world is located in Chengjiang in China, where exquisitely-preserved fossils record the early diversification of animal life. The 525 million year old mudstone deposits in the hills and lakes of Yunnan Province, South China are so fine that they have preserved not only the shells and carapaces of Cambrian animals, but also the detail of their soft tissue. In recognition, the site was added to the World Heritage list by UNESCO in 2012.

A  vetulicolian - a fossil which broadly speaking probably lies on the evolutionary lineage that leads to the vertebrates
A vetulicolian – a fossil which broadly speaking probably lies on the evolutionary lineage that leads to the vertebrates
The arthropod Synophalos showing numerous interlocking individuals in a chain
The arthropod Synophalos showing numerous interlocking individuals in a chain

Professor Derek Siveter, a senior research fellow at the Museum, has been studying this material for a number of years, authoring a book – The fossils of Chengjiang, China: The flowering of early animal life – in 2004. But the rate of discovery of new fossils over the last decade has led to a wealth of new material to be documented.

So Derek recently headed back to the University of Yunnan for a two-week visit, where he began work on a revised edition of the book. Much of the documentation of these important fossils is currently in Chinese, so the new edition will bring the material to English-speaking researchers and fossils enthusiasts too. It introduces both the professional and the amateur palaeontologist – and all those fascinated by evolutionary biology – to the aesthetic and scientific quality of the Chengjiang fossils, many of which represent the origins of animal groups that have sustained global biodiversity to the present day.

Scott Billings –  Public engagement officer

Happy Birthday Darwin!

Onthophagus australis

By Darren Mann, Head of Life Collections

A birthday, on 12 February, and an ‘inordinate fondness for beetles’ are possibly the only things Charles Darwin and I have in common. In his autobiographical notes (1887) Darwin says that at the age of ten he made the decision to collect, but not kill insects; at the same age I was given, by my junior school teacher, four Madagascan hissing cockroaches (the large male I called Burt). So Darwin and I began a lifelong fascination with natural history at a similarly early age, though with very different results.

Much is written about Darwin and his scientific accomplishments, but did you know he was also an avid beetle collector? The quote below is testament to his enduring enthrallment with beetles.

“I feel like an old war-horse at the sound of the trumpet when I read about capturing of rare beetles… It really almost makes me long to begin collecting again”

Trypocopris vernalis
Trypocopris vernalis, collected by Darren Mann, North Wales, 1986

Darwin was also a close correspondent of Reverend F.W. Hope, the founder of the entomological collections at the Museum, and the two often set out on insect-collecting expeditions together. These trips regularly resulted in the capture of rare or unusual species, and an occasional publication.

In 1831, Darwin embarked on his famous voyage around the world as naturalist on the HMS Beagle. He returned to England, in 1836, with around 4,000 insects, some of which were donated to his good friend Hope. Hope scientifically described a few of Darwin’s new species of beetles and named them in Darwin’s honour. Examples include the ground beetle Carabus darwinii and the stag beetle Dorcus darwinii.

Dorcus darwinii Hope, 1841 “The above insect I have lately received from Chili. It is named in honour of Charles Darwin, Esq., who has greatly contributed to our acquaintance with the Entomology of Valparaiso, Chili, and other parts of the South American continent.” Hope, F.W. 1843. On some nondescript Lamellicorn Beetles Transactions of the Royal Entomological Society of London 3(4): 279–283.
Dorcus darwinii (Hope, 1841)
“The above insect I have lately received from Chili. It is named in honour of Charles Darwin, Esq., who has greatly contributed to our acquaintance with the Entomology of Valparaiso, Chili, and other parts of the South American continent.” Hope, F.W. 1843.

During the Beagle voyage Darwin became the first collector of Tasmanian beetles. Onthophagus australis, collected by Darwin in Hobart Town in Tasmania in 1836, is shown in the photo at the top of this post. Whilst in Hobart Town he was also surprised to find

“Four species of Onthophagus, two of Aphodius, and one of a third genus, very abundant under the dung of cows; yet these latter animals [cows] had then been introduced only thirty-three years. Previously to that time, the Kangaroo and other small animals were the only quadrupeds; and their dung is of a very different quality to that of their successors introduced by man.”

This observation, possibly made on his birthday (and what a great way to spend the day) points to research questions that are ongoing today: the effects of habitat change from forest to pasture, and the impact that introduced farm animals have on native dung beetle populations.

In his 1871 publication, The Descent of Man, Darwin returned to dung beetles, writing about their sexual dimorphism, or differences in appearance between males and females, and arguing that there must be a contest between males and females which drives rapid evolutionary divergence amongst populations. There is now considerable scientific evidence to support these views on sexual selection, some based on dung beetle research.

Phanaeus vindex
Phanaeus quadridens from the New World

So we come full circle. I work in the building where, in 1860, there was the first public meeting on Darwin’s then newly-published book, The Origin of the Species, an event now often referred to as the Huxley–Wilberforce debate, or Great Debate. My hobby and research interest focus on dung beetles and their ecology, including the effects of habitat change and loss of dung beetle diversity. And within sight of my office are those dung beetles Darwin wrote of from Hobart Town…

I am fortunate to be part of the curatorial team that looks after Hope’s collection, including those specimens given to Hope by Darwin. We have put a few of these on public display for the first time as part of our ‘Presenting…’ series of temporary exhibitions and to celebrate Darwin’s (and my) birthday I will give an informal short talk in the Museum on Thursday 12 February at 2.30pm, focusing on Darwin material from the collections.

http://darwin-online.org.uk/

Mystery critters

Cambrian muscle worm

Five hundred million years ago, in the Cambrian period, the oceans teemed with strange and unusual creatures that are now preserved as fossils. This period in Earth’s history is important because almost all known groups of animals appear very suddenly in the fossil record at this time. Many of them look just like their modern day counterparts, but several are much more weird and wonderful, with a very different appearance from anything alive today.

I was recently awarded the Whittington Award from the Palaeontological Association which includes a small research grant that will allow me to study one of these weird fossils. The creature in question is known as the “muscle worm”, or Myoscolex, and is particularly interesting because almost the whole fossil is made up of very well-preserved muscle fibres. It’s the oldest record of muscle tissue in the fossil record.

Me, taking a break from fossil hunting to cuddle an echidna
Me, taking a break from fossil hunting to cuddle an echidna

The material comes from the Emu Bay Shale fossil site, located on Kangaroo Island in South Australia. The original collection of fossils is nearly 35 years old now. These original fossils showed the muscle tissue of Myoscolex very clearly, but unfortunately we don’t know much about the rest of its body and scientists can’t even agree on what type of animal it is! Some people believe it is an annelid worm – a segmented creature – while others think it could be an early ancestor of either the arthropods, which includes animals like crabs, shrimp, spiders, centipedes, and insects, or the chordates, a group which includes any animal with a backbone, including ourselves.

Fortunately, many new fossils have been collected in the last few decades that will help us solve the mystery of the Cambrian muscle worm. Active collecting by the South Australian Museum and the University of New England has revealed hundreds of new specimens that show us more details about the anatomy of Myoscolex, including the head, legs, skeleton, and even its digestive system.

I have been working with researchers in Australia on Emu Bay Shale fossils for several years now, both on the fossil collections in the museum and in the field. The Whittington Award will allow me to travel to Australia to study the new muscle worm fossils. The research will involve taking photos, making drawings, and analyzing the nicest specimens under scanning electron microscopes. I will then come back to the Museum in Oxford and compare the fossil information with modern animals found in our collections here. All of this work should allow us to finally figure out what the Cambrian muscle worm really is.

Stay tuned as we try to solve this mystery….

Allison Daley – Museum Research Fellow