1911.] Substances upon the Autofer mentation of Yeast. 4£ 



Table VII. — Effect of Solutions Iso-osmotic with 0-5 Molar Potassium 

 Nitrate. 



No. 84 



10 grin, pressed yeast + 20 c.c. solution. 





KN0 3 



MgS0 4 



BaCl 2 



Mannitol. 



Glycerol. 



Water. 







5 -05 grm. 

 100 c.c. 



18 - 45 grm. 

 100 c.c. 



9 '1 grm. 

 100 c.c. 



13 -65 grm. 

 100 c.c. 



6 "95 grm. 

 100 c.c. 







Depression of freezing- 



1 -46° 



1 -51° 



1 -80° 



1 -57° 



1 -52° 





Time. 



Cubic centimetres of carbon dioxide. 



12.45 

 1.15 

 1.45 

 2.15 



29 -5 

 54 -3 

 75 -8 



27 -0 

 50 -0 

 70 -0 



30 -1 

 57 -8 

 80 -9 



29 -2 

 56 -4 

 78 -5 



27 -6 

 50 -0 

 66-6 



19 -0 

 31 -6 

 41 -0 



These experiments point very strongly to the removal of water from the 

 cell as the essential factor, since it is seen that, when substances which cause 

 plasmolysis are employed, solutions of equal osmotic pressure produce an 

 equal degree of acceleration. 



In order to obtain convincing proof of this, it was necessary to find some 





SODI UM 



CHLORIDE M 



OLAR 

































5 TIME IN 10 HOURS 15 



