The Moccasin-Flower 



compliments piled upon the first as he says " good- 



by." It is doubtful whether in his natural life he ever 



fully effaces the 



telltale effects of 



this demonstrative 



ail rcvoir. 



Such, with slight 



modifications, is 



the plan evolved 

 by the whole cy- 

 pripedium tribe. 

 Darwin mentions 

 bees as the implied 

 fertilizers, and 



doubtless many of the smaller bees do effect cross- 

 fertilization in the smaller species. But the more 

 ample passage in acaule would suggest the medium- 

 sized Bombus as better adapted. 



The large yellow lady's-slipper or whip-poor- 

 will's shoe, C. hirsiitnm, is fond of swampy wood- 

 lands. It has a peculiar, rather disagreeable, oily 

 odor, which might lead one to suppose that flies 

 fertilize it. Darwin, however, whom Professor Asa 

 Gray interested in this species, found that small 

 bees were more serviceable. 



The smaller variety of the yellow lady's-slipper, 



165 



