470 On the Latent Capacity for Mutation. 



quote the pitchers or ascidia, which are analogous to the 

 peltate leaves. It is true that the pitchers often have the 

 form of a cornet or pocket and this restricts the assimila- 

 tory capacity of the leaf; but that only depends on the 

 form of the normal leaf in the species in question. If 

 the latter is auriculate, the pitchers can be quite or nearly 

 flat, and form per- 

 fectly typical peltate 

 leaves ; for example a 

 pitcher-forming Pel- 

 argonium zonale which 

 I have had in cultiva- 

 tion for years and 

 have propagated by 

 cuttings, gives rise, 

 every year, to a num- 

 ber of such peltate 

 leaves especially on 

 short shoots. Simi- 

 larly the first leaves 

 of the twigs of Tilia 

 parvi flora, when 

 changed into ascidia, 

 are almost absolutely 

 flat (Fig. 106 C). 



I ought to say that 

 my conclusions on the 

 mode of inheritance of monstrosities are chiefly based 

 on species of plants other than Oenothera. They have 

 partly been dealt with already,^ and partly will be de- 

 scribed in the second volume of this work. 



Fig. io6. Tilia parviiiora. The forma- 

 tion of pitchers from leaves. A, B, 

 ordinary ascidia ; C, a pehate leaf 

 ("flat pitcher") seen from below. 



^ Ueber die Erblichkeit der Zwangsdrehungen, Ber. d. d. bot. 

 Gesellsch., 1889, Vol. VII, p. 291 ; Eine Methode Zwangsdrehungen 



