46 



LECTURE IV. 



its anatomical structure and in its formation of wood and cortex in the leav^, 

 of the shoot, on the other hand, it is especially the outward form whichl 

 exhibits in astonishing variety the unbounded formative tendency of vegetable 

 substance. I may well expect from my readers that the ordinary external forms. 



Fig. 41. — Clemcetis ■uiticella (after Nageli). End of the 

 shoot rendered transparent, to show the course of the 

 vascular-bundles (leaf-traces), which curve out above into 

 the (removed) leaves. 



FIG. 42.— Course of the vascular-bundles m a 

 monocotyledonous shoot of the Palm type, r 

 growing point ; jf shoot-axis ; W bases of leaves. 

 (After Falkenberg:.) 



of foliage leaves are to some extent familiar to them; that they know the chief 

 division of the same into lamina, petiole and sheath ; that the term stipule^ and, 

 further, the terms eniire, divided, lohed, pinnatifid, compound leaves, &c., are not 

 quite strange to them. On the other hand, it accords with the main object of this 



