278 DEOSERA AXG LICA. CHAF. XIL 



CHAPTEE XII. 



ON THE STRUCTURE AND MOVEMENTS OF SOME OTHER SFECIES OP 



DROSERA. 



Drosera anglica Drosera intermedia Drosera capensis Drosera 

 spathulata Drosera filiformis Drosera binata Concluding 

 remarks. 



I EXAMINED six other species of Drosera, some of 

 them inhabitants of distant countries, chiefly for the 

 sake of ascertaining whether they caught insects. This 

 seemed the more necessary as the leaves of some of 

 the species differ to an extraordinary degree in shape 

 from the rounded ones of Drosera rotundifolia. In 

 functional powers, however, they differ very littlo. 



Drosera am/li'ca (Hudson).* The leaves of this species, which 

 was sent to me from Ireland, are much elongated, and gradually 

 widen from the footstalk to the bluntly pointed apex. They 

 stand almost erect, and their blades sometimes exceed 1 inch 

 in length, whilst their breadth is only the | of an inch. The 

 glands of all the tentacles have the same structure, so that the 

 extreme marginal ones do not differ from the others, as in the 

 case of Drosera rotundifolia. When they are irritated by being 

 roughly touched, or by the pressure of minute inorganic par- 

 ticles, or by contact with animal matter, or by the absorption of 

 carbonate of ammonia, the tentacles become inflected ; the basal 

 portion being the chief seat of movement. Cutting or pricking 

 the blade of the leaf did not excite any movement. They fre- 

 quently capture insects, and the glands of the inflected tentacles 

 pour forth much acid secretion. Bits of roast meat were placed 

 ou some glands, and the tentacles began to move in 1 m. or 



* Mrs. Treat has given an ex- synonym in part of Drosera - 



c( Ment account in ' The American olica), of Drosera rotundifolia uiid 



Js <.turalist,' December 1873, p. 705, filiformit, 

 oi Drosera longifolia (which is a 



