380 



Tricotylous Races. 



the point of departure for the race ; they offer the prospect 

 of provi(hiig a half race. In the third case we may ex- 

 pect to obtain an intermediate race rich in tricotyls. 



Ahnost every year I have made experiments of this 

 kind, but I was especially engaged with them in the 

 spring of 1895. At that time I sowed about 20 grams of 

 each of 40 species of annual plants, or in the case of 

 very small seeds a somewhat smaller quantity, so as to 

 investigate several thousand seedlings of each kind. I 

 shall now give a list of the species falling into the third 

 category, species, that is, which gave so large a number 

 of aberrant forms as to justify the expectation of an 

 intermediate race — an expectation which has, as a rule, 

 been fulfilled, as we shall see in the following section 

 (§5). 



TRICOTYLS FROM BOUGHT SEED. 

 (Spring, 1895.) 



With the exception of Silene, Glauciniu and Nigella, 

 I have raised intermediate races from all these sowings. 

 As I have already mentioned, hemi-tricotyls and tetra- 

 cotyls are seen to be rarer than the typical tricotyls. A 

 sample of seed of Lobelia Erinus, grown in the spring 

 of 1902, had a very high proportion of tricotyls, viz., 

 31 in 100 seedlings. 



