390 Bibliography. 



11. MonograpJiie d'' Echinodermes vivans etfossiles, par L. Agassiz. 

 3d and 4th livraisons, contenant les Galerites, et les Dysaster, par E. 

 Desor, et I'Anatomie du genre Echinus, par G. Valentin. 17 plates. 

 Neuchatel, 1842. Livraison 4 has a folio atlas of 9 plates, illustra- 

 ting the anatomy of the genus Echinus. — This valuable work is now 

 continued by the addition of the two parts above mentioned, and we 

 refer for the general plan and contents of these former parts and the 

 design of the work, to our former notices in Vol. xxxvii, p. 369, and 

 Vol. XLii, p. 378. 



The part here devoted to the anatomy of the genus Echinus, is writ- 

 ten by the friend of Prof. Agassiz, Professor Valentin, and will be 

 found an important addition to our knowledge of this order of animals. 

 The accompanying plates are done in a masterly style, and almost su- 

 persede the necessity of detailed anatomical description. 



We are not informed whether M. Valentin is to go through the other 

 genera of Echinodermes in the same style, but infer that such is the fact. 



We received also by the same parcel, the 14th livraison of the Fossil 

 Fishes, both text and plates. 



12. Delia Elettrotipia Memorie di Francesco Zantedeschi con 

 cinque tavoli elettrotipiche di Zantedeschi e Antonelli. Venezia, 

 1841. 4to. pp. 52. — This is the title of an elaborate memoir on the 

 electrotype, by Prof. Zantedeschi of Venice, which we have received 

 recently from the author, through the kindness of Prof. J. W. Draper 

 of New York. The illustrations of Prof. Zantedeschi are taken from 

 subjects of highest art, and some of them are done in sharper clear- 

 ness than any electrotypes we have seen, particularly as most of them 

 are merely outlines, requiring the utmost delicacy of finish to produce 

 the effect designed by the artist.* 



Prof. Z. discusses the science connected with the art in a very satis- 

 factory way, but he seems to have confined his attention chiefly to the 

 deposits of copper, and not to have extended his researches to other 

 metals under the same circumstances. We have reason to believe 

 that one of the most useful applications of this art to the wants of so- 

 ciety, is in the manipulation of the precious metals ; and we are re- 

 cently informed by a manufacturing house, that they have succeeded 

 perfectly in the substitution of electric gilding for the old process by 

 mercury, and that the results are more satisfactory in every way, both 

 in the uniformity in thickness of the deposit and in the health of the 

 workmen, as well as in economy. 



* We must except from this remark, the illustrated copy of Thomson's Seasons, 

 edited by Mr. Corney, (Longman & Co., 1842,) in which all the illustrations are 

 from perfect electrotype copies of the most exquisite wood engravings. 



