Adventuring to the west coast of Scotland in search of DNA
Laura Sivess, Research Assistant for the Darwin Tree of Life project, shares the experience of being on a Museum field trip.
The Natural History Museum (NHM) Darwin Tree of Life (DTOL) team recently returned from Millport, Scotland, where in just over four days we encountered over 150 species and took 266 tissue samples for whole genome sequencing!
With COP26 on the horizon this November, world leaders will gather in Glasgow to discuss climate change and accelerate vital action towards the goals previously outlined in the Paris Agreement. Should these collaborative efforts fall short however, it will not be the decision makers who will be affected the most, but instead the planet’s young people who will live with the consequences of such inaction. At the Museum we are working hard to empower young people to speak about their views on the planetary emergency and listen to what they are telling us.
The Natural History Museum houses the Carpenter Eozoon Collection. Collection that has been the object of a long controversy between evolutionists and “old-school” naturalists. The significance of Eozoon hinged on its Precambrian age, with some scientists regarding it as a foraminiferan (single celled shelly marine organisms) and hence the oldest evidence for life on earth, while others considered it to have an inorganic origin. Even Charles Darwin cited Eozoon in his work On the Origin of Species of 1866, accepting its identity as an ancient fossil. This Eozoon is now universally recognised as being inorganic in origin.
William Benjamin Carpenter (1813-1885) was an expert in the study of Foraminifera and this made him the chosen person to confirm that the Canadian specimens were indeed of foraminiferal origin. If this was correct, these specimens would be a cornerstone for the study of early life, contributing significantly to an understanding of the origin of life on earth.
Their microscopic structure initially gave no evidence of organic structure. But, in 1864, similar specimens were found in the Grenville Limestone near Ottawa. Thin sections were prepared and sent to Sir John William Dawson (1820-1899) who identified them as foraminifera. Thin sections were also sent to Carpenter who supported Dawson’s opinion. Subsequently, Carpenter accumulated a huge collection of rock samples from around the world containing Eozoon from which more than 1000 slides were made and presented by his son, the Reverend Joseph Estlin Carpenter (1844-1927), to the British Museum (Natural History) in 1892, almost seven years after the death of his father.
Since its deposition, the Carpenter Eozoon Collection remained untouched until 2014 when it was decided that the long overdue conservation and curation of this controversial and important historical material should be undertaken.
The unusually thick layer of dust on the specimens inside the cabinets attracted our attention and led us to search for other parts of the Carpenter Eozoon collection. This collection was found to be distributed in different buildings and contained in several cabinets. Part belonged to the Mineralogy Section and part to the Palaeontology Section, reflecting the early controversy over the inorganic vs organic origin of Eozoon. The Eozoon Collection is mostly distributed in the specimen drawers of the main collections, except for two small wooden cabinets that are kept inside of one of the larger collection cabinets in the Palaeontology Building. The latter material was the focus of a study combining curation and conservation work. The material contained in the wooden cabinets contains cavity slides, thin sections and hand samples. One of these small wooden cabinets contained specimens that were covered by a very thick layer.
During the cleaning process it became apparent that the dust covering the specimens inside one of the small wooden cabinets was different from the dust accumulation in the other cabinet, which was very dark in colour. This suggested that these specimens could have been stored in a different environment from the others and had a separate history. The dark coloured dust could have come from a domestic fire used for heating, an accidental conflagration, or from the smoking of tobacco as it has been seen on other specimens.
We collected several samples of dust from the outer part of one of the dirtiest specimens for SEM-EDX (scanning electron microscopy with energy dispersive X-ray spectroscopy) analysis. At the same time, we investigated the history of the Carpenter Collection both before and after it was transferred to the NHM UK. We tried to match the results of the chemical analyses and the historical record, in order to shed light on the source of the unusually high density of dust. Chemical analysis of the dust revealed high contents of Ca and S, interpreted as indicating the presence of gypsum, most probably of anthropogenic origin (plaster?).
The Eozoon specimens were housed in William Carpenter’s private residence from his retirement in 1879 until his death in 1885. It is during this time when Carpenter devoted most of his time to his Eozoon Collection, working on a monograph, accumulating further material and making drawings to support his interpretation of this “fossil” as a foraminiferan.
One possibility worth considering for the origin of the dust covering the specimens that it represents is soot and other debris resulting from the accidental house fire that led to the death of Carpenter in 1885. No details of the extent of the fire are known but it would have at least burned in the room where Carpenter kept the vapour bath for treating his rheumatism if not elsewhere in the house.
Lessons learned: The collections should be inspected and recorded their state upon arrival at the Museums, in order to take any remedial work necessary before their storage, avoid deterioration.
To know about this: Sendino M.C., Cuadros J, Allington-Jones L, Barnbrook JA (2015) Chemical Analysis of the Dust on a Historically Important Collection: The W. B. Carpenter Eozoon Collection at the Natural History Museum, London. Collections: A Journal for Museum and Archives Professionals, 11 (4): 291 – 304.
This year I’m writing a diary entry each month for a typical week in the life of a Principal Curator at the Natural History Museum. In the July entry, I join a team carrying out fieldwork at a secret Jurassic location, analyse some interesting fossils from Vietnam, make a start on assessing and rationalising our collections documentation, submit a paper publishing a set of important microfossil images, and start a project studying micrometeorites.
What would you ask if you could ask a curator anything? This Ask a Curator Day we brought together a panel of experts from across the museum to answer your burning questions on collections, research, preparing millions of specimens for the move to Harwell Campus and much more. In this blog we share some of the highlights.
This year I’m writing a diary entry each month for a typical week in the life of a Principal Curator at the Natural History Museum. In the June entry, I provide my fingerprint and quote for an art project, review our sectional documentation, review a paper on the Downton Gorge in Shropshire, put together a grant proposal and have a late night call out to mitigate a leak threatening the collections.
by Clare Matterson, Executive Director of Engagement
It is wonderful to have the Museum open again and to welcome visitors back to our galleries and gardens. Reopening has enabled us to reinstate and extend our provision for neuro-diverse audiences and better serve our local communities. At the same time, work has also continued apace behind the scenes to make our Museum and workforce as inclusive as possible.
In this blog, we’re looking at a recent paper that cited some of our data in investigating the conservation potential of protected areas of rainforest using data on the Woolly monkey (Lagothrix lagothricha).
This year I’m writing a diary entry each month for a typical week in the life of a Principal Curator at the Natural History Museum. In the April entry, we are offered a large microfossil collection, I review a paper about left and right coiling microfossils, help prospective visitors to apply for funds, provide some images to help university remote teaching and have a virtual meeting with our new director.