BOTANICAL SUBJECTS. 



229 



Fig. 81. Unexpanded leaf of Viola odorata (Payer, pi. 37). 



These tooth-glands are evidently the homologues of ovules, 

 aiich as we see in Sparmannia Africana, Fig. 82. 



Fig. 82. Different degrees of development of the ovule of Sparmannia 

 Africana (Payer, pi. 5). 



I found that each of the teeth-glands* of the cherry secretes a 

 drop of limpid liquid. I also found that the largish reddish 

 glands on the petioles, which are a feature of this class of trees, 

 secreted a similar liquid. 



The glands on the petiole evidently stand for aborted side 

 lea^fiets, which are a common feature in the Rosaceae, that is, 

 although the leaves of the cherry and others are simple, they 

 descend from compound leaves, like those of the rose ; and the 

 large glands on the petioles are merely the remnants of aborted 

 leaflets. I This remnant I consider to be the amalgamation of 

 the teeth-glands of the aborted leaflets into one large gland. I 



* The teeth-glands are well shown in the leaves of Passiflora vitifolia 

 {Gard. Chron., 23 Aug. 1890, p. 243). 



t In like manner, the leaves of Collet ia ahort into either stipels or glands. 

 iGard. Chron., 10 Jan. 1891, fig. 13). 



