BOTANICAL SUBJECTS. 



145 



digits) they are still inherited, as remnants of bygone parts, 

 because the force of heredity is too strong for their total suppression. 

 The accompanying diagram (Fig. 28) is an attempt to reinstate the 

 oriofinal form. 



Fig. 28. 



In the "Wistaria (a) remain, (6) are entirely suppressed, (c) are 

 aborted as stipels, and all the petiolets have disappeared excepting 

 that of the odd leaflet. The leaflets (a) have become sessile, leaving 

 no room for leaflets (6), and of (c) only abortions remain as 

 stipels. So that the simple contraction of the petiolets has caused 

 this transformation. 



3. In Erythrina the leaf is trifoliolate. It has two very small 

 stipels at the base of the pair of leaflets. There is, in addition, a 

 pair of glands just above the pair of leaflets and two more at the 

 base of the odd leaflet. The diagram (Fig. 29) shows the probable 



a 



Fig. 29. 



A p. 1724. 



K 



