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Posts in category G. van Iterson jr

Material relating to van Iterson’s work and/or lab

Here there be surprises!

Thanks to the hard work of volunteers over the last couple of decades, the catalogues for the various collections in the Archive are gradually becoming more detailed, and this continues, in combination with document scanning. Also, now that we’re going to be moving to another building at the end of the year, the current team has been investigating cupboards and boxes that were fairly low down the priority list. We’re often surprised by what we find. Many things shed light on how things were done in the late 19th and early 20th centuries, others are simply curiosities which may add to our questions even as they answer others. For example, letters by van Iterson to an instrument maker explained the envelope full of paper discs labelled “anorthoscope” and we then discovered in the Instrument Catalogue that we still have one! Anorthoscopes might be considered to be a forerunner of movies where the user turned a handle and figures on paper discs seemed to walk or run. Judging by the results of internet searches, they’re largely considered to be toys, but van Iterson was obviously using them for some sort of research, although we still aren’t sure what! The images with this post show examples of other finds.

In roughly chronological order:

Beijerinck started as a botanist (the discipline of microbiology hadn’t really been invented then) and wrote his PhD thesis on plant galls. It was obviously a subject close to his heart since he kept his samples, including a couple of boxes containing 19th century pillboxes full of different sorts of gall.

Beijerinck’s work on TMV is credited as being the first to establish that the causative effect of Tobacco Mosaic Disease was self-replicating and thus not a chemical. That we have his lab journals is well-known, but we also have the plates used to illustrate that first paper (and many others). There’s actually 5 plates in this set, each slightly different so that the published image was correctly coloured.

A fairly recent gift to the collection was a set of brown notebooks that were found after the death of the donor’s relative. These proved to be a full set of lecture notes made by a student during Beijerinck’s microbiology lecture series. We’ve also been given the set of notes that Kluyver made for his speeches when his PhD students were awarded their Doctorates, among other things. I love the moment when someone comes through the door and says “someone I know is clearing a house and wants to know whether the museum wants this”…

Harry Barker spent a year with Kluyver in the 1930s, doing some of his early work on methane-producing bacteria, and his slides are among a pile of microscope preparations from that period that turned up in a cupboard. As well as the slides, we have glass bottles containing chemicals, preparations and samples, including a very early enzyme extract labelled “lactase”. There was still measurable activity in the sample when it was tested in 1989 despite the fact that storage conditions have been less than optimal over the century since it was made.

During WW2, Kluyver was Chairman of a committee that tried to maintain contact with the students who’d been taken as forced labour to work in Germany. We still have many of the papers relating to that time, including the card indexes showing where the students were, and where they were working, as well as correspondence from students and the authorities. (Ignore the key, it’s just there to hold the papers flat.)

When Mrs van Iterson visited the laboratory (quite a long time ago), she commented (more than once) that she wished that her husband had had a computer. When one looks at the drawings and calculations (made with nothing more than graph paper, log tables and a slide rule) it’s easy to see why. His work on phyllotaxis is still regarded as relevant today, and is a tribute to the days and days of patient calculation and drawing that formed the foundations of modern mathematical modelling.

Educational wall charts – where are they now?

During the second half of the 19th century and the early years of the 20th, a number of companies produced wall charts as teaching aids. The theme and quality varied enormously, but most of the ones intended for bioscience education are not only very detailed, but generally beautiful in their own right. They were sold singly, or by subscription. Subscribers were sent the charts as they became available (often 1-2 per year), together with explanatory books.

Delft’s collection includes several complete series, including those by Kny, Dodel-Port and the series known as the Tabulae Botanicae (often attributed to “Blakeslee et al”, but most of the posters are signed by R. Erlich). However, we also have a number of incomplete series which might be represented by a single example, or a few posters. Some complete series are available elsewhere. For example, the conifers chart shown here is number 16 of 50 by Albert Peter – a complete series is held by the University of Bourgogne. However, many seem to have been forgotten.

With the help of collections around the world, it has recently been possible to assemble an electronic complete series of Pfurscheller’s zoological charts (here represented by the fly). Representatives from other partial series are shown here:

The Mycorhiza chart is number 10 from “Pflanzenphysiolgische Wandtafeln” by Frank & Tschirch (we have 1-10 of 60), most of the series is held by the University of Utrecht, among others.

The sweetcorn is number 3 in series C of a set for general biology by Haecker & Mülberger. Series A and B are both currently known by single examples, and Delft currently has 1-4 of series C,  the size of the complete set is unknown.

The flowers come from a set by O.W. Thome (Delft has numbers 15 & 23).

The microorganisms come from a series by W. Henneberg about microorganisms with positive or negative impacts on the fermentation industry. This is number 6, vinegar fermentation. Delft has 8 of an unknown number.

 

Glass negatives galore!

Small projector set up for glass negatives.

Small projector set up for glass negatives.

Glass negatives.

Glass negatives.

 

Our glass negative collection (about 27,000 of them) dates from the mid-1880s to the 1960s (when they were being used with the electron microscope. It covers a remarkably wide range of topics including Beijerinck’s gall wasps, light microscopy, travel (especially van Iterson’s working trip to Indonesia) to images from publications – essentially what any group of Professors would have in their Powerpoint collections today. The quality of the images is amazing – it has been possible to enlarge pictures to A0 without grain or blurring.

Later posts will showcase the individual collections of the three Professors, this is just a taster to show examples of what we have.

 

 

 

 

 

 

 

 

 

Brendel flower models

The collection includes about 20 of the flower models made by Robert and Reinhold Brendel in the late 19th and early 20th centuries. The models are made from  papier-mâché with other materials including plaster, glass beads, wood, cotton and rattan added to give detail or texture. They can be taken apart to reveal internal details (although they’re not always simple to put back together again). The Brendels were advised on the accuracy of their models by various Professors, depending on what the particular model was intended to show. As well as plants, models of fungi, yeast and bacteria were eventually included.
Dealers included the models in their own catalogues, but Delft has the only known surviving Brendel catalogue, issued in Berlin in 1913.

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