Bauhaus-Universität Weimar

Reports of Visits to Foreign Laboratories, vol. 4 (1923) [Illustrated Typoscript in 7 volumes] Reproduced with the kind permission of Dr. Cecil E. Leith
Benedict, Francis Gano
that Professor Ewaardemaker's son, Dr. Ewaardemaker (who had been his 
assistant for two or throe years), spent much of his time with us and took 
us about Utrecht. A more charming, attractive, intelligent young man I 
have never met. He is a worthy son of his father. V/e subsequently saw 
him rather extensively and talked with him at Edinburgh, where our earlier, 
very fine impression was fully justified, 
Ewaardemakor maintains that polonium rays have a distinct biological 
advantage. For e cample, when a frog’s heart is perfused and allowed to 
stop beating, polonium rays start it up after a relapse. He lias been work¬ 
ing with uranium salts and certain calcium ions. He showed us some 
polonium rays by moans of a zinc sulphide screen. One of his assistants 
had been working on the minute volume of oxygen and GOg, using Professor 
Noyons' electrolytic apparatus for determining COp. The subject was 
standing or lying* The tilting table he used was not comfortable for 
lying* 'biit they found no change between lying and standing, which was rather 
surprising to me, except perhaps the person was uncomfortable lying and 
this increased the metabolism to the standing point. The assistant told 
us the electrical method gives 3.0 or 3.1 per cent, that is, about one part 
in thirty, but he thinks it can actually be a little better. 
Ewaardemaker remarked that Noyons also had an apparatus for the 
analysis of oxygen by the same method. Later on, in visiting Noyons' 
laboratory, we found that this wa3 not the case. 
A photograph of Professor Ewaardemaker at his desk was taken (see 
figure 66).


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