( 385 ) 



the cells, whereas exclusively the Na Cl-solution exercises an in- 

 fluence on the volume in consequence of its concentration. 



This does not seem to be in accordance with the function of 

 the bladder as a reservoir for the refuse products, of which the urea 

 constitutes an important, and for the organisation a very injurious part. 



There must be factors then, which counteract the resorption of 

 urea in the wall of the bladder. 



Physics. — "An anomahj in the coarse of the plaitpointcurve in 

 a mixture of anomalous substances." By Prof. J. D. van 

 DER Waals. 



In the „Zeitschrift fur physikalische Chemie XXYJII Heft 2" 

 KuENEN and Robson have couimunicated observations on the mutual 

 solubility of liquids, which give occasion for a short remark. In 

 mixtures of ethane and ethylalcohol or one of the following alcohols 

 they found, that the plaitpointcurve consists of two isolated bran- 

 ches, which intersect, and end on the curve which indicates the 

 pressure of the three phases. In the following figure their result 

 has been represented schemetically. 



P 



Let Ci be the critical point of ethane, Cj that of alcohol, then 

 C'4 indicates the point, in which the plaitpoint, originating in Cj 

 can be observed no longer and it seems to serve as terminating point 

 of the pressure of the three phases. Then C3 indicates the point, 

 in which the plaitpoint, originating in C^ cannot be observed any 



