Geology and Natural History. 71 
8vo, London, 1879. (Van Voorst.)—This handbook, well known 
to chemists, contains notices of new methods of manipulation, with 
twenty-three figures of apparatus adapted for improved laboratory 
— and the supplement will be found useful in every working 
aborato 
14, " Specific Gravity of the —— ow. Phosphoric Pentasulphide 
and Indium Chloride—Victor Meyer and Cart Meyer have 
determined the s specific aavisiin of =a vapors by the method 
of displacement which they devised and had previously described. 
ey have found, in two determinations for the vapor of phos- 
phoric pentasulphide, the specific gravities 110°1 and 110°7 when 
H,=1 and for that of indium chloride the value 113°6. As the 
half molecular weight of P. $ is 111, it is sore dar that this com- 
pound—unlike P,Cl,—is converted into vapor without disasso- 
ciation ; — since the specific gravity of ae vapor set ye 
Apu 1879, p. 6 
? IL GEoLogy AND NATURAL HIsTORY. 
eur Bidduanpspcchid e nm, vO seaiic VON 
Mogsvir, pp. 8vo. Sper 1878. " (Alfred Holder.)—The 
Dolomite region of the Southern Tyrol is well known as one 0 
the most remarkable portions of the Alps, both in the unique 
beauty of its scenery, and in the variety and interest of its geo- 
logical structure. e ngely picturesque and wo ully 
pee forms of the dolomite mountains, sn agg in Poe ne 
ar and again as sharp jagged peaks, give the re 
ra charac < of i As : Mor v he - He interest 
region by one whose lon rience in the study of the Eastern 
Fe bas et thoroughly log = for his work. In addition to the 
special description of each section of the country, with the 
numerous cuts and profile views, the work also includes several 
chapters of more general interest, and one of these contains a 
i Permia: 
