SECT, l] 



PHYSICO-CHEMICAL SYSTEM 



365 



the corresponding adult animals. Fig. 20, taken from Bialascewicz, 

 shows that the potassium preponderates in the former and the sodium 

 in the latter, while the other inorganic substances are more or less 

 equally distributed. As there is no difference in electrolyte con- 



70- 



-S 604 



to 



50 



40 



30i 



20 



10 



:2 



o 



CO 



I 



O 



o 

 o 





^ 



to 



I 



^= Potassium ^ = Calciu 



= Sod'rum 



Fig. 19 







^ 



= Magnesium 



centration between the continuous ooplasm phases of fresh-water 

 and marine animals, one must conclude that salts do not 

 account for the properties possessed by the latter, and that crystal- 

 loidal organic compounds, such as taurine, urea and glycine, play 

 an important part in keeping up a high osmotic pressure. Thus 

 Bialascewicz found a concentration of 8-43 gm. per litre of urea in 



