176 



the other side. Rev. J. D. King, who is familiar with the marine 

 flora of Martha's Vineyard, informs me that he has never found 

 it there; Mr. W. A. Sctchell has looked for it, unsuccessfully, in 

 Long Island Sound; and as there is no reliable report of its 

 occurrence elsewhere on this coast, I think it safe to say that it is 

 practically confined to a few miles of shore from Wood's Holl 



no 



rtli. 



At the southern point of this range are the extensive works 

 of the Pacific Guano Company, which has for some twenty years 

 brought here for manufacture large quantities of phosphate from 

 South CaroHna and the Caribbean Sea. But for several years 

 previous to 1870 this company obtained its raw guano from 

 Rowland's Island, which is nearly in the center of the range of 

 the alga In question in the Pacific Ocean. If we compare the 

 dates given above, and consider the very limited district inhab- 

 ited by this species here, its abundance in that district, and its 

 absence from adjacent districts where the conditions arc the same 

 and the marine flora in other respects is identical, it seems to me 

 at least probable that we have a case of a species introduced by 

 human agency; probably the first case noticed among the algpe 



of this region. FRANK S. COLLINS. 



A Possible Natural Hybrid. 



The two species of Tragopogoji are not rare in some patches 

 of grass-land near New Brunswick, the T, porrifolius^ L., being 

 the more common and very likely the older fugitive from Europe, 

 while Z! pratoisis^ L., is a smaller but none the less attractive 

 species. A very marked difference in the color of the flowers 

 serves to distinguish the species instantly when in bloom. The 

 particular purpose of this note is to record the discovery of a 

 probable hybrid between these two closely related species of sal- 

 sify. One plant has been found conibining the characteristics of 

 the violet-purple species with those of the yellow 7\ pratensis. 

 In size, the plant in question ismidw^ay between the two species ; 

 the peduncle has less of the swollen and fistulose nature of 1\ 

 porrifoliiis, and is more enlarged than those of the normal 7! 

 pratciisis. The involucral bracts surpass the flowers in the pur- 

 ple species, while in the yellow they are equalled, if not exceeded 



