470 PROCEEDINGS OF THE AMERICAN ACADEMY. 



.00210 m. MgClj. 



Time hr. 24 hr. 



No. of Stentors 100 2 



No. of Divisions 



Mortality 98 



Mean Result 0.02 



Series 4. Expt. No. 48, Apr. 12, 1902. 



(All Stentors originated from culture No. 20318.) 



.00100 m. KCl. 



Time hr. 43 hr. 3 da. 



No. of Stentors 100 lOo 109 



No. of Divisions 5 9 



Mortality 



Mean Result 1.05 



.00100 m. NaCl. 



Time O.hr. 43 hr. 3 da. 



No. of Stentors 100 106 117 



No. of Divisions 6 17 



Mortality 



Blean Result 1.06 



.00070 m. CaCla. 



Time hr. 42 hr. 3 da. 



No. of Stentors 100 99 105 



No. of Divisions 6 



Mortality 1 1 



Mean Result 0.99 



.00D70 m. MgClo. 



Time hr. 42 hr. 3 da. 



No. of Stentors 100 80 77 



No. of Divisions 



Mortality 20 23 



Mean Result 0.80 



It is evident from the preceding experiments that for tlie three salts, 

 potassic chloride, sodic chloride, magnesia chloride, I have reached the 



