386 Tricotylous Races. 



beginning of the flowering period all these were covered 

 witli fine gauze, guarded from the visits of insects and 

 artificially fertilized every day or every other day. About 

 300 seedlings of each plant were recorded. The ratios 

 were from to \.2^/o with an average of 0.8%. Two 

 parents had 1.4% and one 2%, that is to say, that here 

 again there was no progress. The offspring of the six 

 parents fell into groups between which the differences 

 were but slight (3 with 0.7%, and 3 with 0.8% on the 

 average). 



In the list which follows I have collected the highest 

 values that were obtained in the course of these genera- 

 tions. 



, SPRING OF ^ 



1893 1894 1895 1896 



Highest values 2.8 % i.l % 3.7 % 2.0 % 



Selected seed-parents 2.8% 1.0% 2.1% — 



These figures show a fluctuation within fairly nar- 

 row limits, but no essential advance in the course of four 

 generations. It seemed therefore to be useless to carry 

 the experiment further. It is certainly probable that, 

 in the course of time, further selection might have 

 brought about some slight improvement; but obviously 

 this would have been of little significance, and at any 

 rate there was no prospect of ever obtaining a race with 

 50% tricotyls. 



Chcnopodhiiu olbuiii. A tricotylous plant flowered in 

 1889, In isolation in my garden, and produced 1% tri- 

 cotyls in the spring of 1890 amongst about 1000 seed- 

 lings. Four of these were cultivated further, but their 

 seeds gave rise again to no more than 1%. The third 

 generation Avas therefore not better than the second. 



Dracocephahiiu inoldaviciim (Fig. 82). In the spring 



