Fishes. 4111 



Trifolium procumbens. Hop Trefoil. 



Probably the plant from which Mr. Gregson bred Coleophora 

 deauratella (Zool. 4030). It is sad that a half-made observation like 

 this should be allowed to relapse # in to obscurity. 



Lotus corniculatus. BirdVfoot Trefoil. 



Speyer mentions as feeding on this plant, Leucophasia Sinapis and 

 Thanaos Tages. This plant is rather favored by the larvae of Tineina, 

 or probably it would be more correct to say that it has undergone 

 more careful scrutiny ; Gelechia ligulella feeds between united leaves 

 in May, Gracilaria Kollariella mines the leaves in July, Coleophora 

 discordella feeds on the leaves in autumn and May, and a Nepticula 

 (not yet bred) mines the leaves in July. 



H. T. Stainton. 



Mountsfield, Lewisham, July 16, 1855. 



Inquiries into the Philosophy of Zoology. By R. Knox, M.D., &c. 

 Part I. — On the Dentition of the Salmonidce. 



In the admirable volume of the ' Histoire Naturelle de Poissons,' 

 in which my esteemed friend M. Valenciennes has discussed the 

 natural history of the Salmonidae, that distinguished naturalist lays 

 down a doctrine that, in respect of the division of the Salmonidae 

 into genera or subfamilies, the dentition is the only natural-history 

 character to be absolutely depended on, and that, in point of fact, it 

 has never failed in his hands. 



To arrive at this conclusion M. Valenciennes has been forced 

 lo exclude from all consideration the natural history of the young, 

 alleging, what no doubt is true in a certain sense, that " the 

 naturalist, as a naturalist, is concerned with or interested only in the 

 adult." By this view, however, my friend embarrasses himself, with- 

 out seeming to be aware of it, with the difficult question of age. 

 Anatomists know well that the adult condition is not so easily 

 determined even in mammals, and much less in fishes. 



In accordance with views and researches conducted in this spirit, 

 my esteemed friend arrives at the conclusion that the Salmonidae now 



