Invertebrates In Vitro

Written by Paolo Viscardi, Curator of Zoology, National Museum of Ireland – Natural History

I’m not sure why, but people really seem to love Blaschka models.

Beccaria tricolor [sic] Nr.373 in Blaschka catalogue. Specimen NMINH:1886.810.1 at the National Museum of Ireland.

Beccaria tricolor [sic], Nr.373 in Blaschka catalogue. Specimen NMINH:1886.810.1 at the National Museum of Ireland. Image by Paolo Viscardi, 2018

They are the subject of a surprisingly large number of enquiries at the National Museum of Ireland — Natural History (AKA the Dead Zoo), where I look after the zoology collections.

If you’ve not heard of the Blaschkas, they were a father and son company of lampworkers based in Dresden, who supplied museums and universities around the world with glass models for teaching and display. Between 1864 and 1890 they made mail-order models of invertebrates (alongside glass eyes and medical equipment), then from 1890 until 1936 they worked exclusively for Harvard University on the Ware collection of glass flowers.


Bouquet of Blaschka glass flowers made in 1889, gifted to Elizabeth C. and Mary L. Ware. Now part of the Harvard Glass Flowers exhibit. Image by Bard Cadarn, 2018.

At the Dead Zoo we have a particularly large and comprehensive collection of the invertebrates, with around 590 models acquired in lots between 1874 and 1888. I say ‘around’, because many of the models are made up of multiple parts, with different developmental stages, enlargements and details that are classed as elements of the same model.


Three larval stages in the development of Asteracanthion pallidus [sic] from a model containing ten parts. Nr.659 in Blaschka catalogue. Specimen NMINH:1886.684.1 at the National Museum of Ireland. Image by Paolo Viscardi, 2018

This poses a bit of a documentation nightmare, as parts of a developmental series have become separated, requiring a good knowledge of the biology represented to allow parts to be reunited and their numbers reconciled. This is made more complicated again by historic loans of specimens to other institutions and changes in the acquisition and registration processes over time.

Data management aside, our extensive collection acquired over a number of years offers an exciting opportunity to track the development of the Blaschka’s skill and techniques, especially when compared with even older collections in other institutions. Some key factors in the evolution of the design appear to be when Leopold (the father) took on Rudolf (his son) in the workshop full time in 1876 and then when the two of them joined Isis (not that Isis – the Dresden Natural Sciences Society).

A large part of the importance of membership of Isis was access to scientific publications with good quality colour illustrations. The earliest Blaschka models (1864-1876) were pretty basic – many were based on illustrations from a children’s encyclopedia, while others were based on depictions on anemones by Philip Henry Gosse, which were pretty, but not particularly detailed (they also suffered from terrible taxonomy).


The models started off very small and brooch-like, using expensive coloured glass, but a period of experimentation with new methods of colouring the models with wax and paints swiftly followed. Presumably this was to help keep costs down as the size of the models increased. Unfortunately, the inclusion of wax turned out to be a bad idea for the structural integrity of the models, so many with a wax infill have broken over time.

As the Blaschka’s access to scientific illustrations improved, so did the variety and accuracy of their models. The last of the invertebrate range they produced in the late 1880s were details of the structure of sponges based on illustrations from the HMS Challenger expedition. Interestingly, they managed to get these plates before the full report was published, presumably directly from Franz Schulze, the German sponge specialist who wrote the report and was a regular customer of the Blaschkas.

The later models also tended to use glue for fixing and coloured paper behind translucent glass rather than wax infills, making them less prone to exploding when it got too warm. We’ve discovered so much about the construction of the models from damaged examples that now we’re more interested in broken Blaschkas than pristine examples.

I’ve been working with Dr. Emmanuel Reynaud from University College Dublin, and a huge gang of collaborators to delve deeper into the collections at the Dead Zoo and those held in other museums and universities around the world. We’ve been sharing – and requesting information using social media, with the hashtag #BlaschkaMonday and we’re creating a huge database of information about the models.

If you have any Blaschkas and you want to find out more about them, or if you can share your knowledge and perhaps some photos of broken models, then please get in touch and get involved!

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