The Question of Inundation.—Bibliography. 275 
domorphic. Now admitting that the total number of minerals known 
is 642, the proportion of minerals in which pseudomorphism is found 
reaches one-fourth this number. 
In this connection we may remark that these minerals are found for 
the most part in the metaliferou rocks, 
ati 
475 centimetres eep. Gueymard has concluded that the inundation 
which on the 30th of May, 1856, overflowed the valley of the Isére would 
v 
earth would then cate absorbed a layer of water 9°5 centimetres deep 
and the evil would have been averted. 
@ principal remedy for inundations is nap olor to be found in turf- 
mg. Gueym pend estimates -— years as the time necessary to produce 
upon the flanes of panei a sod of i acas consistence to resist 
the sappeared under the t of he petal. es with it the 
Most oficient protection against Satins 
The French government has taken these observations under serious 
Consideration, and made them the subject of careful study. 
Bibliography. 
BOSSANGE, Paris, has recently published: —- 
Pe ie du Jeune Age, par sins Leresoutter, Professor de Zoologie & la ‘ac- 
ulté des Sciences de Reve —This is a beautiful beret in quarto w ith colored 
figures. Professor Lereboullet is one ‘of the + distinguis! ts in 
La Ch A co nsiderable part siggy eg entary and in the fori @f) : 
ing imie Organique ve fond la Synthese, par MarcELLIn BeRtHoLet, 2 vols. 
vO, 1860, [This work is snitioed above, p. 310.] 
Les’ Elec ectro-animants et Vadhérence Magnetique, par J. Nioeuds—This i is a 
Ee new, and full of facts uot before published, (see this Journal 
Pp. 
elementary Coo sique, par Pouituer, 3d edition in 12mo—This eae coelinnt 
“sentary work for those who are commencing the study of Physics. 
