JENNINGS— HEREDITY IN PROTOZOA. 



463 



Table XVIII. — Continued. 



cent, to 23.517 per cent., and at the same time correlation between 

 the two fell from .6469 to .5955. 



Thus, within a week we find enormous fluctuations in breadth, 

 due to changes in the amount of food, while the length remains about 

 the same. The breadth is much more affected by nutritional changes 

 than is the length. 



Rapid Multiplication. — To the watch-glass culture just described 

 (row 3) new hay infusion was added. Twenty- four hours later 

 (June 18) multiplication was occurring actively; stages of fission 

 and all the stages of growth were numerous. Measurements of 195 

 specimens, taken at random at this time (Table VII., page 412, and 

 row 4, Table XVIII.) show a very great increase in the range and 

 amount of the variability in length, while there is little change in the 

 breadth. This is, of course, due to the fact that the culture contains 

 many young ; these differ much from the adults in length, but little 

 in breadth. The mean length decreases from 185.008 to 176.124 



