236 Non-Isolablc Races. 



individuals on which these numbers were observed f cul- 

 ture of 1896): 



Abnormal leaves 1 23456789 

 Individuals 58 10 12 4 2 2 1 1 



The 58 normal plants were pulled up. Of the rest 

 four were weak and died; there remained 28 which all 

 flowered together. Their seed was harvested separately 

 after the number of 4- and 5-foliate leaves on each parent 

 had been recorded. 



In March 1897 I sowed a part of this seed in pans, 

 separately for each seed-parent. The object of this was 

 to find out whether there was any difference between the 

 individual seed-parents with regard to the number of 

 anomalous offspring which they produced. From an 

 examination of the pans it was easily seen that the ab- 

 normality had already appeared in the primary leaves of 

 some of the seedlings. In the great majority of cases 

 these were perfectly normal, consisting of one leaflet as 

 in the whole of the previous generation. In some cases 

 however this primary leaf consisted of two or three 

 leaflets (Fig. 47 B-C). Such occurred in the crops raised 

 from 6 of the 21 plants whose seeds had been sown. 

 Each seed-parent had given a crop of about 300 seed- 

 lings. Five of the crops contained not more than 2 ab- 

 normal seedlings, but the remaining one had a very large 

 number, namely 14 amongst 335 seedlings or about 4%. 

 It is worthy of notice that the parent of this crop had only 

 had two 4-foliate leaves itself and thus had not given 

 the least sign that it would produce offspring with so 

 much higher a degree of the abnormality. Moreover I 

 could not find any relation between the number of ab- 

 normal leaves on the other seed-parents and the pro- 

 portion of abnormal offspring raised from their seeds. 



