51 



taincd a i)rccipiUitc by almost the same amounl of alcohol 

 in all the tubes. Plotted in a curve, the alcohol number of 

 the extract under different hydrogen ion concentration gives 

 almost a straight line, (Fig. 2.). The differences in the growth- 

 indexes obtained may very well ])e explained as a result 

 of the different solubilities of the acid- and alkali proteins 

 produced, rather than it should be explained as the result 



12 3 4 5 6 7 

 > Alcohol in cc. 



II 12 13 U '5 16 17 



Fig. 2. 

 The solid line indicates the alcohol number of embryonic tissue juice under 

 different pH The dotted line indicates the pH of the redissolved precipitates. 



of different more or less definite proteins. The experiment 

 seems to speak much in favour of the assumption of Hertz- 

 feld and K linger ^se^ 257) They consider the proteins 

 in the blood and body juices as a series of disperse systems 

 with different sized particles, from the biggest represented 

 in the fibrinogen and globulins and down to the smallest 

 dialysable products, and not as a compound of more or 

 less characteristic, well defined chemical bodies. 



4* 



