390 Bibliography. 
11. Monographie d Echinodermes vivans et fossiles, par L. AGassiz. 
3d and 4th livraisons, contenant les Galerites, et les Dysaster, par E. 
Desor, et |’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. xxxvul, p. 369, and 
Vol. xu, p. 378. 
The part here devoted to the wiles 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. Della 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 
pe, 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 s0- 
ciety, is in the manipulation of the precious metals; and we are re- 
cently informed by a manufacturing house, that they have succeeded 
Cl in the substitution of electric gilding for the old process by 
, and that the results are more satisfactory in every way, bot 
loa in thickness of the deposit and in the health of the 
» as well as in economy. 
* We mu Pecks is emack, the illustrated copy of Thomson's Seasons, 
sit Cae eno cs, toe ont all the illustrations are 
=i 
