1908. 1 



JENNINGS— HEREDITY IN PROTOZOA. 

 Table X. — Continued. 



431 



as a whole contains a large number of young specimens, so that the 

 mean of the adults would be greater than that of the random saniple. 



2. The mean breadth of the young is almost exactly the same as 

 that of the culture as a whole. 



3. The relative variation in length is much greater for the young 

 than for the culture as a whole, the coefficient being 13.729 for the 

 former as compared with 8. 834 for the latter. Moreover, the coeffi- 

 cient of variation is almost three times as great as in the very young- 

 est stages before separation (Table X., row i), or in the first stages 

 of fission (Table X., rows 25, 30, 33, 36). 



This great variability of the young at this age indicates that they 

 are growing rapidly in length ; those five minutes old are considerably 

 longer than those that have just separated, so that when all are taken 



