468 



JENNINGS -HEREDITY IN PROTOZOA. 



[April 24, 



a fresh hay infusion. At once the culture "spread out" greatly, in 

 a way that will appear on comparing Table XIX., for the starving 

 culture, with Table XX., for those twenty-four hours in nutritive 

 fluid. Many of the animals began to grow at once after they were 

 placed in the nutritive fluid, so that the maximum length increased 

 from 176 to 220 microns, the maximum breadth from 40 to 80 

 microns (see rows 8 and 9, Table XVIII.). Others had not yet 

 begun to increase when the sample of Table XX. was taken, so that 



Fig. 5. Characteristic forms and sizes from a culture of descendants of 

 D {caudatum form), that had been starved for a week (Table XIX.), then 

 was left twenty-four hours in fresh hay infusion (Table XX.). a and b, 

 Starved specimens, c, d, c, f, transitional forms, becoming large and plump 

 in the abundant food ; g, characteristic large, plump form, a to g from Table 

 XX. h, characteristic form a week later (Table XXI.) ; animals becoming 

 thinner again, but retaining the increased length. All X 235. 



