CONTENTS. ¥ 
XVIII —Contributions tothe Chemistry of Copper; by T. 
Srunny Howr..coP ert Fj 2iase. oo rss eee 153 
XIX.—Notice of a recent Landslide on Mount Passacona- 
way; by Gro, H. Perk 158 
XX.—On the Silver Mines my Sas eine: State of Chihua- 
hua, Mexico; by James P. Kiwpaxt, 161 
XXI.—Machinery and Processes of the Industrial Arts, and 
Apparatus of the Exact Sciences; by Freprrick ‘A. P. 
BARNARD, 175 
XXIT.—On Norite or Labradorite Rock; by T. Srerry 
PUNT ngs 80 
XXIIL—On the cause of the color of the Water of Lake Le- 
man, Geneva: by Ava. A. Hares, occu cate cs 186 
XXIV. —Contptbariins to Chemistry from the Laboratory of 
the Lawrence Scientific School. No, [X.—On the Potas- 
sio-Cobaltic Nitrite known as Fischer’s Salt, and some 
analogous and related compounds; by Samuert P. Sapr- 
189 
LER, 
XXV.—Notice of some Fossil Birds, from the Cretaceous 
and Tertiary Formations of the United States; by O. C. 
XXVI.—Contributions to Zodlogy from the Museum of Yale 
— College. No. ibe tapr aemaire of Shells from the Gulf 
of California; by A. E. Verrit 217 
XXVII.—Notice of Dr. Gould’s Raat on the Trans-Atlan- 
tic Longitude, -- 
XXVIIL—Meteors of November, 1869; compiled by H. A 
4 
Newton, 244 
SCIENTIFIC INTELLIGENCE. 
Physics and istry —On Ammonia-cl jum b , CLEVE, 251 ORD Pe 
sulphur salts, ScuNEIDER, 253.—Synthesis of Hydroxylamin, Lossen : On a new 
group of double chlorids belonging to the platinum bases, BucKTON, 254.—A sys. 
tem of instruction in Quantitative Chemical Analysis, by Dr. a 
from the last English and German editions, edited by Prof. 8. W. Jomnaow: Ef. 
fects of the Sun’s Heat on a Sand Hill, Gzo. Davipson, 255.—On n the existence 
of Ammonium in the Ammoniacal Amalgam, and on a new Test for the presence 
ot Nast Hyogo, y Annu H. Gala, 256—n ‘Existence of an Al 
_ loy of Ammonium and Bismuth, ler ney P 
cent en, D, : 
Mineralogy and : tnd Gaiogy—Prininary ald Repo of te U.S. esa ure 
of Colorado and New Mexico, conducted, und te ary of Hon J.D ox, 
Secretary of the Interior, by F. V. HAYDEN, 358.-_The Gold Fields and 
