( 122 ) 



livdrogen. We found for the volume susciptil)ility K=^ — 0.186 X 1^ *" 

 and, taking- Dewar's value for the density of liquid hydrogen 0.07 

 we find V =r: — 2,7.10"-^. Within the limits of experimental error 

 this value agrees with that calculated by Pascal •) / = — 3,0.10-'^ 

 from the organic compounds. As we do not propose to repeat this 

 determination for the present we think that there is sufücient reason 

 for us to communicate this result here. 



Physiology. — ''The pi'rmeahiliti/ o/ hlood-corpu.sc/c.s In phi/siu- 

 /(x/iail conditions, cspeci'i/fi/ to alhdl and eartk-alkall metals" . 

 By G. Grijns. 



Messrs Hamburger and Bubanovic reproach me in their communi- 

 cation in the meeting of February 25, 1911, that in my criticism (Proc. 

 of Oct. 21), 11)10, p. 481)) I should not have taken account of the 

 fact, that, after the addition of watei- or NaCl, the original \olume 

 was used again for the analyses. This accusation is unjustified. 

 Messrs. H. and B. said in their communication of June 25, 1910, 

 p. 259 : "'To accompUsh this in an eficient manner, a certain quan- 

 tity of blood icas centri/ugalized, the serum luas partly removed and 

 mixed irith the necessary amount of XaCl, or loater ; then it was 

 added to the rest of the blood and well mixed with if- 



This seemed to me perfectly clear and rational. Relying on it 1 have 

 calculated the dilution by the water on the entire quantity of blood. 

 Now Messrs H. and B. say, that they retained so mnch fi-om the 

 serum mixed with water or with NaCl that, after the mixture with 

 the residue, the original volume was obtained. Consequently they 

 followed another method than the one they described. I therefore 

 complied with their request and repeated my calculations with this 

 new statement. 



In the experiments with water we must now not calculate the 

 quantity of a component of the blood (hat the mixture must contain 

 by multiplying the total quantity by the fraction indicating to what 

 proportion the entire quantity was diluted : but we must subtract 

 1/Tl of the quantity contained in the serum from that total quantity. 

 For only from the serum something is taken off, and there after 

 to 10 parts of the sei'um that is still present, 1 part of water 

 has been added, as follows likewise from the example given on 

 p. 220. 



1) P. Pascal Ann. chira. el phys. (S) t XIX p. 5; 1910. 



