262 Ostenfeld. 



These short descriptions will show how different the members of 

 this family were. It is worth noticing that No. 461, 465 and 465 are 

 vegetatively, especially with regard to the development of stolons, 

 weaker than both the parents. Most frequentty hybrids are said to 

 be vigorous and often more vigorous, than the parents. 



Only the four first enumerated specimens have kept under culti- 

 vation, and I have followed them through several generations. 



I. H. excel/ens x aurantiacuvi , No. 463^. 



The primary hybrid, Fi, died in 1905, after bearing fruits under 

 isolation. Hence arose an Fg of 3 individuals, all of which were 

 vegetatively weak, without regular development of stolons and with 

 pure yellow hermaphi odite flowers, thus quite like the F^. In one 

 of these individuals castration, as well as isolation, was made with 

 respectively 4 and 3 heads, but the development of full fruits was 

 very slight. Thus the F3, which arose from sowing of these fruits, 

 consisted of only 4 and 8 individuals, all alike und all like Fj. F4 

 came out in 1909, but did not reach flowering. 



We thus have full constancy in the second and the third hybrid 

 generation, in so far as the small number of developed fruits permits 

 us to judge. 



2. H. excellens x H. aurantiacum, No. 460. 



The primary hybrid from 1904 is still alive. Without isolation 

 seeds were got, which gave rise to an Fo of 25 individuals, all alike 

 and like Fj, and female. As this experiment was not exact, a corymb 

 of the primary hybrid was isolated in 1906, and from the gathered 

 seeds there came 85 individuals of F2, all alike and all like Fj, yet 

 with the exception of one individual which had reddishly tinged leaves 

 and scape. One corymb of this individual was isolated, and an F3 

 of 38 individuals was produced, all ahke and like F^, i. e. without 

 any reddish tint; nor was the F2-individual itself this year reddishly 

 tinged. The reddish colour is consequently not inheritable, but is 

 no doubt a result of bad conditions, most probably of drought, and 

 was here most hkely caused by ants, which, by establishing their nest 

 round the base of the plant, let too much fresh air into the soil and 

 perhaps also injured the roots. 



In this hybrid also there is full constancy in the second and the 

 third generation. 



