33 



„that too few plants were measured, I know of 

 „nothing else to cause distrust in the resuit. 

 „The cross-fertilised flowers on the parent- 

 „plants were, on the other hand, rathermore 

 «productive than the self-fertilised flowers." 



Bei Primula sinensis: „The offspring of plants, 

 „some of which were legitimately and others 

 „illegitimately fertilised with pollen from a 

 «distinct plant, were almost exactly of thesame 

 „height as the offspring of self-fertilised plants; 

 „but the former with rare exceptions flowered 

 „before the latter. This species iscommonly 

 „raised in England from self-fertilised seed..,. 

 „Moreover, many of them are now varying and 

 „changing their character, so asto become in a 

 „greater or less degree equal-styled, and in 

 «conséquence highly self-fertile." 



The re fore I believe that the cause ofthe cros- 

 sed plants not exceeding in height the self-fer- 

 tilised is the same as in the two previous ca- 

 ses of Pisum sativum and Canna. 



Bei Passiflora gracilis. «This annual species pro- 

 «duces spontaneously numerous fruits when 

 «insects are excluded. Fourteen fruits from 

 «crossed flowers contai ned on an a ver âge 24.10 

 «seed s. Fourteen fruits (twopooronesbeingre- 

 «jected) spontaneously self-fertilised under a 

 «net, contained on an average 20.58 seeds per 

 «fruit; or as 100 to 85." 



«The mean of the two crossed is 49 inches, 

 «and that of the two self-fertilised 51 inches; 

 «or as 100 to 104" 



Ich muss hier bemerken, dass bei der Beurteilung der 

 relativen Fruchtbarkeit in Acht genommen werden muss, 

 dass die selbstbefruchteten Samen in der Art gewonnen 



Recueil des trav. bot. Néerl. Vol. IV. 1907. 3 



