GABRIELLE L. C. HOWARD. 49 



parents either in 1912 or 1913. Seven cultures were grown in 

 the F3 generation and here a distinct difference can be seen in the 

 limits of variation of the individual cultures. Three, namely 738,736 

 and 167, have a period equal in length to both parents combined, 

 while 740, 132 and 694 more or less resemble Type 51. Cultures 

 representative of each of these groups, namely 738 and 694, were 

 chosen for future experiment, and six plants of the former and 

 five of the latter were grown in the F^. It wiU be seen that the 

 cultures grown from 738 have again segregated. Two, 738-15 

 and 738-96, cover approximately the period of the two parents. 

 One, 738-81, is distinctly earlier than the early parent, and the 

 others vary over different ranges. The culture 694 has, on the 



I. 



7pe 9 X Type 51. 



4____________ — — 177 



3_ — _ — ___ — — _ — — — — 180 



!o 17 11 5 2 — — — — — — — — — — 175 



:6 24 26 23 7 7 6 1 2 — — — — — — 176 



3 31 24 19 8 7 5 2 — — — — — — — 179 



9 40 17 13 7 3 — 2 1 _ _ _ _ — — 179 



2 6 10 18 12 18 18 20 9 18 5 2 — — — 138 



3 8 16 15 19 20 30 31 12 11 4 4 — — — 173 

 - — 1 17 18 24 33 33 21 24 14 4 4 — 1 194 



7 3 12 10 11 21 20 28 22 21 11 6 2 — 1"4 



