so 



THE ROYAL SOCIETY OF CANADA 

 Table XIV. 



The most striking feature of the results as a whole is their marked 

 uniformity. No matter how unlike the parents may be, nor at what 

 region of the general range of variation two slightly different parents 

 may be located, the F2 variation is strikingly uniform, varying only 

 in extent and even in this respect not so much as the parental dif- 

 ference. 



Another kind of experimental result is the establishment of the 

 fact that earliness and lateness are inherited independently of other 

 qualities. It might be expected that earliness would be correlated 

 physiologically if not genetically with shortness or low yielding 

 capacity. Our preliminary observations indicate that this is not the 

 case. The earliest plants of an F2 generation are frequently quite as 

 large and productive as the latest grand parent. This shows that 

 earliness can be brought into association with the most desirable 

 qualities by the usual Mendelian methods. On account of the fact 

 that most F2 plants are intermediate, however, a much larger 

 number of plants of this generation must be grown in order to secure 

 any desirable combination than is the case in simple examples of 

 segregation. 



(2) Heading Period. 



The results in connection with the inheritance of the heading 

 time are very similar to those of the ripening period. Tables XV to 

 XIX illustrate this fact. The results are not so valuable because the 

 differences are not so great. But they are evidently due to the same 

 hereditary causes, and confirm the correctness of the results already 

 given. In point of experimental accuracy the heading results are 

 superior to the ripening ones. Of course those plants which head 

 earliest in general ripen earliest. The ripening time of the plants 

 which head on a given day varies to a certain extent but this 

 variation is small compared to that of the generation as a whole. 



