Tricotylous Half Races. 381 
Very small proportions of tricotyls were yielded by 
Silene hirsuta, which only produced 3 in 80,000 seed- 
lings. The following species produced from 1-2 speci- 
mens in every 10,000 seedlings: Argemone grandiflora, 
Aster tenellus, Clarkia elegans, Godetia ainoena, Hyos- 
cyainus pictus, Silene Armeria, and others. I observed 
no tricotyls at all in sowings of the same extent of 
Argemone mexicana, Datura lacvis, Hyoscyamus albtis, 
Nigella damascena, Phacelia texana etc. I tested 800 
seeds of each of 8 species of Cerinthe, and only obtained 
a single tricotylous plant in C. bicolor, C. gymnandra 
and C. major. 
The seeds mentioned were all obtained from the 
nursery of Messrs. HAAGE & SCHMIDT in Erfurt. It is 
not unlikely that if the seeds were bought from other 
nurseries, different results could be obtained, especially 
from firms who do not exchange seed with the nurseries 
at Erfurt. 
Similarly the seeds of wild species occasionally pro- 
duce tricotyls, but, as it seems, only in very small quan- 
tities, and they have hitherto given no promise of yield- 
ing an intermediate race. As instances I mention Ra- 
phanus Raphanistrum and Epilobium hirsutum, of which 
species I found 1-2 tricotyls in large crops. If the seeds 
of wild species come from botanical gardens the pro- 
portion of tricotyls is sometimes greater; for instance 
in Silene noctiflora (1892) it was about 20 in 10,000 
seedlings. Amongst trees I have hitherto found tri- 
cotylous seedlings abundantlv in Acer Pseudo-Plat anus 
and Fagus sylvatica and also in Robinia Pseud-Acacia 
and Ulmus campestris. 
In order to test the hereditary capacity of the cotyle- 
don variants in such crops, I have frequently planted 
