CONTENTS, vil 
XXX. On Vibrating Water-falls; by Prof. Erras Loomts, - 352 
XXXI. On the Rocks of the Quebec Group at Point Lévis,—(in 
a letter to Mr. Joacnim Barranpe of France, from Sir 
Wituiam E. Locan), - 3 
XXXII. Chauvenet’s Manual of Spherical wid Practical eau: 378 
XXXII. Remarks upon the causes producing the different char- 
acters of vegetation known as Prairies, Flats, and Barrens 
in Southern Illinois, with special reference to observations 
made in Perry and Jackson counties; by Henry EnceLMann, 384 
XXXIV. On the Earth’s Climate in Paleozoic Times; ‘ 
T. Sterry Hunt, M A., F.R.S., - - 
XXXV. Correspondence of Jerome NicKés. ener César 
Mansuéte Despretz, 398.—Marcel de Serres: Horace Ben- 
edict Alfred Moquin-tandon: Auguste Bravais, 401.—Léon 
Péan de St. Gilles: Discovery of fossil man, 402-—The 
manufacture of alcohol by means of iljuminating gas, 403.— 
New method for the concentration of mineral waters, 404. 
—Manufacture of ice, 405.—Building Materials—Preserva- 
tion by means of the residuum of coal-tar, 406.—Bibliogra- 
phy, 407. 
SCIENTIFIC INTELLIGENCE. 
Physics —On the density of vapors at very high temperatures, DevILLe and Troost, 
408.—On the work of elastic forces: On the atomic constitutiun of liquids, Wainer, 
409.—On the absorption of gases by charcoal; by Dr. R. Ancus 
Chemistry—On Anilin dyes, sigh 8 On the constitution of American Petroleum, — 
PeLouvze and Canours: esium, separation from Rubidium,  Bekein: 413. 
_ Equivalent of Cesium: woke of CsCl: Spectram of Cesium, 414 —Prelim- 
inary notice of a New Metal; by F. Re:cu and Tu: Ricuter, 415—On some 
volatile alkulvids given off during putrefaction ; ~ Dr. Crace Catverr, 416, 
de Bibomorgariide in Photography; by Mr. Emerson J. Revvowps, 416.— 
A process for the reduction of ope waste, seus and Sautiibi vk: Sulphocyanid 
of ammonia as a fixing agent, by G. W. Simpson and Mr. Lewirsxy :. Redevelopers 
BLANCHARD, 417 a ese sty 419. 
_ Agricultural Chemistry.—On the fertilizing action of Gypsum, Drniratn, 419, 
Mineralogy and Geology.—On the phosphatic (or guano) rock from the Island of Som- 
brero, W. L; by Dr. T. L. Parrsox, 423.—Observations on the Sombrero Guano; by 
A. A. Jotten, 424—On the nature of Jade, and on a new mineral species described by 
Mr. Damour; by T. Sterry Hont, F.R.S., 426.—Geological a of Canada, 428. 
—Air-breathers of the Coal Period ; by J. Ww. Dawson, LL.D., 
_ Botany and Zoology.—Origin of Varieties in Plants, 432--Review of Mémoires et Sou- 
__-venirs de Augustin Pyramus DeCandolle: On Welwitsehia, a new genus of Gnetacee ; 
by Josern Hooker, M.D., F.R.S., etc., 434—American Tea-plant: The Compass 
Plant, 439. 
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