37 



may proceed to further calculations. The values of the three con- 

 stants D. r. R are immediately connected by noticing' that 



; ■ R = 2Dr\o^,^e. (7), 



Jf we take -/t* = 2.79 . 10~^*' cm^ and use (5) above, we find 



r:= 0,751 . 10-5 cm, (8) 



a result which does not differ much from the previous estimate (3).. 

 The value of F being known, the dissipation constant k can be 

 obtained with the aid of the relation 



i: = 7icrill. (9> 



Using (8) above, we get A; = 2,16 . lO^* sec~^. 



In the year 1905. Mr M. F. Mc Do well repeated Mr Cotton's 

 experiments and succeeded in extending them in some respects 

 {The Physical Review. Vol. XX. p. 163; see Errata at the end of 

 the Volume, New-York 1905). The method he employed had the 

 advantage of considerable sensibility and made it possible to take 

 numerous readings in different parts of the spectrum; his solutions, 

 however, were not exactly the same as those investigated by Mr 

 Cotton; thus the results of these observers are not comparable. 

 Moreover, Mr Mc Do well's method of calculating the ellipticity 

 seems unable to yield trustworthy results. 



,3. O stosiinkach zasad mineraliiych do kumsozv zv /jkh- 

 xvidtoiuym nioczu ludzkim. — Vher die Verhaltnisse 

 von anorganischen Basen zu Sduren im nornialen Men- 

 schenharu. M^moire de M. STANISLAS KOZtOWSKI, presente 

 dans la stance du 7. Decembre 1908 par M. L. Marchlewski m. t. 



In Ankniipfung an die von Bondzynski und seinen Mitarbei- 

 tern ^) gemachte Entdeckung einer neuen, unter dem Namen von Oxy-, 

 Antoxy- und AUoxyproteinsaure beschriebenen Gruppe von Verbin- 

 dungen im normalen Harn suwie im Blut von Menschen und Tie- 

 ren (Hund) wurde in unserem Laboratorium oft der Gedanke aus- 



*) Im Harn von Kaninchen und Giinsen wurden diese 8auren sp&ter von 

 Wilhelm Ginsberg gefunden. 



