PETERS. 



METABOLISM AND DIVISION IN PROTOZOA. 



497 



The combination of the largest number of physiological salts used has 

 given the best result, and there is additional evidence of the good adjust- 

 ment of Stentor to calcic chloride and di-potassic phosphate as is shown by 

 the following experiments : 



Expt., Jan. 28, 1903. 



Media. 



.00055 m. CaCl 2 



and 

 .00015 m. MgS0 4 



and 

 .00015 m. NaN0 3 



and 



.00015 in. K„HP0 4 

 .00055 m. CaCl 2 



and 

 .00045 in. K 2 HP0 4 



Ohr. 



Ida. 



3 da. 



50 



77 



85 



50 



83 



This experiment merely adds evidence for the good adjustment to a 

 combination. To test further the proposition regarding the comparative 

 action of salts singly and in combination, I selected the above mixture 

 of four salts for study in the next experiment. The high results obtained 

 indicate that it represents constitutive proportions and is therefore adapted 

 to the proposed test. 



Expt., Feb. 2, 1903. 



Ohr. 



50 



Media. 



.00055 m. CaCl 2 



and 

 .00015 m. MgS0 4 



and 

 .00015 m. NaN0 3 



and 

 .00015 m. K.JiPOj 



.00055 m. CaCl 2 50 



.00015 m. MgS0 4 50 



.00015 m. NaN0 3 50 



.00045 m. K 2 HP0 4 .... 50 

 .00015 m. MgS0 4 



and 

 .00015 m. NaNO. 



Ida. 



56 



50 



26 



27 



4 



3 



37 



TOL. XXXIX. 



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