be found to stand as represented in 

 the accompanying figure G. But in a 

 few seconds a movement of depres- 

 sion takes place, through which the 

 pollen-mass is brought invariably into 

 the position represented in figure H. 

 And now, upon again inserting the 

 point of the pencil into the orifice of 

 the nectary, the p( " 



Scientific Intelligence. 



J by its viscid disc, 



3" of the Orchids of our district,— giv _ 

 ng, however, that our observations, made during the past summer, 

 were so hurried and casual that they must not be too much relied upon. 

 They may serve a purpose in directing the attention of others to the sul-ject. 



the fertilization of Platanihera Hookeri (this volume, p. 143), we will 



Platanthera orbieulata, one of our most striking species. Of this we 

 first received some spikes in early bud, — in which state it is plain to see 

 that the discs of the pollinia are an integral part of the stigma, their vis- 

 cid surface being then contiQuous with that of the stigma. It may be 

 worth mentioning that these spikes, stuck into a glass of water for 

 eiglitor ten days, developed many of their flower-buds tolerably well, 

 excepting the spur, which instead of elongating remained a scroiiform 

 protuberance,^aD 'arrest of development'— and at length sphacelated. 

 The full-grown spur in this species being an inch and a quarter or an 

 divergent bases c 



fertilization is efl'ected by tlie agenc 

 ;ra. Self-fertilization is out of the c 



rated by tbe broad stigma that the viscid discs stand nearly a q« 

 J the ag 

 irge Lepidoptera or Hymenopter? 

 lion. Here th ' ' " 



The way in wl 



binedarmsof ^ . . _ 



__ __ ,.. „.,,... ,^^ v.. w-v. ^ - _: the nectary, 



iswelJ exhibited in Hooker's" figuTeortlils speciesrin the Flora Bor. 



sentod. These, being aflixed to the stalk of" the pollen-mass laterally, by 

 body called the drum-like pedicel, (here developed per- 

 iore than in P. Hookeri,) really look forward and inward 

 ) placed that they will be sure to stick one to each side of the 



project 



