392 



7^ricotylons Races. 



tion of tricotyls was 1 to 2% and reached 3 and 4% 

 so rarely that these numbers must perhaps be regarded as 

 the extreme results of the errors of observation which 

 are bound to occur in such countings. In two species 

 the ratio was about 10 to 15%, but these were both 

 perennial forms which, in my annual cultures set but little 

 seed. They were Lychnis fulgcns, from 1892 to 1895, 

 with 5 — 13 — 11 and 8 — 19% tricotyls and Pcnstemon 

 gentianoidcs in the same years with 3 — 12 — 11 and 15%. 

 They should perhaps be excluded from further considera- 

 tion. Summarizing my data therefore (with the omis- 

 sion of these cases) we obtain a very uniform picture 

 of the inheritance of tricotyly in half races under con- 

 tinued selection. 



INHERITANCE OF TRICOTYLY IN HALF RACES UNDER 



CONTINUAL SELECTION. 



Thus we see that tricotylous half races exist which 

 even under the most stringent selection can produce only 

 small percentages of this anomaly. So far as we can 

 conclude from indirect data, half races of this kind ap- 

 pear to be widely distributed in the vegetable kingdom. 

 Samples of seed, whether they be bought or collected in 



