ELEMENTARY BOTANY 



103 



List of All Known Plants ' 



How many plants were there in the longest list ? 



As we found with animals, so with plants we can hope 

 to learn even the names of only a small number, and we 

 must select these, as we do our friends, with great care. 

 There are some that we meet every day, so common that 

 we ought to know them. Others are so beautiful or fra- 

 grant that we would go far to visit them. 



1 1 am indebted for these estimates to Prof. George E. Stone, Amherst, 

 Mass. 



2 Saccardo's estimate. 



