418 MINERAL CONCHOLOGY. 



foreign demand, — one fourth of the entire number, — is much greater than 

 we should have supposed ; and we are led therefore to consider the rea- 

 sons still more urgent, why this demand should not he supplanted by a 

 continental edition. We think the continuation of this work, and also 

 the ' Species Conchyliorum ' by Mr. G. B. Sowerby, of such importance, 

 that it would afford us no slight satisfaction if their claims upon the re- 

 sources of the British Association, were to be taken into consideration at 

 the Birmingham meeting. 



We have just received the 10th and 12th livraisons of the ' Poissons 

 Fossiles,' — certainly two of the most beautiful which have yet appeared. 

 Several plates are appropriated to the Ichthyodorulites and the teeth of 

 Hybodus, but there is nothing bearing upon the subject of the supposed 

 frontal spine in this genus. We perceive that the letter addressed to us 

 by Prof. Agassiz, has been lithographed, and copies inserted in the livrai- 

 sons of this work. 



We have much pleasure in acknowledging the receipt of two portraits, 

 one of Mr. Children, and the other of Mr. Spence, just published by Mr. 

 Raddon, formerly a London Artist, but now a resident of Bristol. We 

 can bear personal testimony to the faithfulness of the first, and we think 

 highly of both as works of art. 



Should Mr. Raddon meet with encouragement, we understand that he 

 will publish portraits of other distinguished entomologists. 



Letter from Mr.. James De Carle Sowerby, on the subject of the 

 French Edition of Mineral Conchology. 



Camden Toivn, July 27, 1839. 



Sir, 



It is hardly possible that T should remain silent 

 after seeing, from the strictures you have made on the French 

 edition of my ' Mineral Conchology,' the great interest you 

 feel in the cause of that class of authors, whose works are si- 

 milar in character to this publication. And feeling practically 

 that unless some protection be afforded them by at least their 

 brother authors, and the scientific portion of the public, they 

 must soon be reduced to that small number who are suffi- 

 ciently opulent to pay for the satisfaction they experience 

 in their own minds, in being able to contribute to the ad- 

 vancement of knowledge, I beg to thank you for the man- 



