620 



Lorande Loss Woodruff. 



2, Experiments with Potassium Chlorid and Sodium 



Chlorid. 



The experiments with KCl and NaCl were conducted precisely 

 the same as those with the phosphates of potassium, except that an 

 f^ solution was used in place of the y 2%o of the phosphates. The 

 accompanying curve (Diagram X) gives the results of the experi- 

 ments. 



The striking point about the effect of initial stimulation with 

 KCl and NaCl in each dilution used is that they all accelerated 

 the fission-rate during the first part of the experiment, and had a 

 still greater opposite effect during the latter part, so that the "net 



Potassium Sulphate and Magnesium Sulphate. 

 K2SO4 MgS04 



Diagram XI. 



Effect of initial and daily stimulation with K2SO4, ^^^ and ^,-^, and MgS04, ^5^ and g°^, on the 

 division-rate of Gastrostyla. Averages are for five-day periods. The eight experiments plotted in this 

 diagram were carried on simultaneously from August 15, to September 4, 1904. Method of plotting is 

 the same as in Diagram VIII. 



effect" for the twenty-day experiment was a marked falling off in 

 the number of divisions. A closer analysis of the results shows 

 that KCl produced a greater variation from the control than did 

 NaCl both when used as an initial and as a daily stimulus. In 

 every case also the greater dilution produced the greater variation. 

 Daily subjection to each of the salts proved to be uniformly 



