KXPLANATION OF PLATE II. 



I'ig. I. — Gcnninatinj^ plaiitlet, Liquidaniber styraciflua, L. 



Fig. 2. — Leaf from Liquidamber tree five or six years old. 



^^^S- 3- — Germinating plantlet, Liriodendrou Tulipifera. 



Fig. 4. — Tj'pical leaf of Liriodendron Tulipifera. 



Figs. 5, 6, 7. — I'Mrst, second and third year's growth of Trillium 

 grandiflorum. 



Figs. 8-12. — Podophyllum peltatum; ir, first year's growth; 8, 9, 10, 

 growth of second year; 12, peltate leaf, which does not appear until 

 third year. 



FMg. 13. — Seedling Rubus villosus, showing that the first leaves to 

 appear are simple. 



Fig. 14. — Leaf of R. villosus, showing a transition stage preceding 

 the common trifoliate form. 



I'Mg. 15.— Leaf of same, illustrating the development of the cjuincjue- 

 foliate, from the trifoliate form. 



Fig. 16. — A portion of a fruiting cane, of R. villosus, with trifoliate, 

 and simple leaves at base of fruit clusters. (The simple leaf alone 

 being found toward extremity of cane.) 



