Geology and Mineralogy. 411 
taining Mesodon and An chitheri um, the Pampean or Pliocene; 
the lower containin Typotherium, the upper Zguus. ove 
_ are the Tehuelche or Erratic formatio euiltts Glacial ; the Post- 
Pampean or Diluvial, and the Arian formation or alluvial, 
hysical Survey in Georgia, Alabama and Mississippi, 
along the line of the here ce Pacifie Railway, by Messrs. Camp- 
BELL and Rurrner. 8 pp., 8vo, with two folded maps and 
sections, This report is for the most part economical in ne 
coma ita but gives much geological information on the co 
rmation, including its stratification and flexures, and iileathates 
the geology of the country by a colored geological map. 
Use of solutions of ton a specific gravity in the study of 
rocks.—The Sonstadt solution, of mercuric iodide in potassium 
iodide, is now in general use by lithologists as a means of obtain- 
ing a mechanical separation of the constituents of a rock. Its 
use, ho owever, is somewhat limited — the maximum specific 
pipe 06).— kee, xx, 169, 1883. 
lite : A new Mineral. —MM. G.-Cesaro and G. Despret 
h en the na 
Richelle in the neigtburliond ‘ee Visé, Belgium. It occurs in com- 
yellow on alteration. siantet greasy or resinous to earthy. Hard- 
hess between 2 and 8 ; specific gravity 2. An analysis gave the 
following results 
Pio. Fe,0; Al,Os CaO ign. 
(3) 23°67 28°71 1°80 5°64 35°54=100°36 
At 100° “ eres loses 23°33 per cent H,O, and at a red heat 
6°10 H,O a The authors leave the composition of 
r he 
the iron; the microscopic examination which the authors promise 
to make m twas throw some light upon the subject.—Ann. Soc. Belg. 
83. 
8. Classification of Meteorites.—Professor TscneRMAK, who 
has made many important contributions to the stud 
