220 SUMMARY OF CONCLUSIONS. 



among plants ; and we find that, even in the same families 

 and these highly natural ones free zooids occur in some 

 species and not in others, closely allied ; of this, many 

 illustrations have heen given in the course of the foregoing 

 remarks. The occurrence of pullulation is even more irre- 

 gular, not serving always even as a generic character ; 

 thus, we have arborescent, herbaceous, and even annual 

 species in the same genus, as in Solanum, Veronica, and 

 Hibiscus. 



