144 



PHILOSOPHICAL NOTES ON 



suppressed, Avithout leaving any trace of their former existence in 

 that position. 



Fig. 25. Occasional leaf of Hardenberyia Comptoniana. 



2. The Wistaria leaf (Fig. 27) has several pairs of leaflets and 

 an odd one. Each leaflet has a stipel, and the odd one has two, as 

 shown in the accompanying diagram. What do these stipels mean p 

 They are depauperized leaflets, the Wistaria leaf having probably 

 descended from one with trifoliolate pinnae. They are not needed now 

 in this plant, but, like the splint bones of the horse (depauperized 



<^ 



<S> 



Fiff. 2G. 



Fig. 27. 



