CONTENTS. vii 
P 
XXXIX.—On a so ap eas of the Jagn Vacuum or Filter se 
Pump; OR Boor 5 a. es a ee oct eee 360 
XL.—Chemical Papers fue the Massachusetts oO * 
Technology.—No. II. On the Synthesis of Hydr 
bons ry — treatment of Cast Iron with Acids; by RI 
eee os eee oe feel es eee Ss ee " 363 
No. 
of Magne esia; by L. F. Woop, -- ------------=--=5-3 368 
es Glaciers of the Glacial Era in Virginia; by R. P. 
XLIl. On the Hypsometric work of the U.S. Geological and 
Ons Ne Survey of the Territories; by J. a yy 373 
N 
BCTRNTINTO Recetas 
Physics and Chemistry.—On the Chemical Activity a on which Copper has 
been deposited, GLADSTONE and TRIBE, 377.—On a Method of Estimating Nitric, 
Chloric and Iodic Acids, THORPE, 378. _On the “Ga of the Continuous Chlo- 
rine process, DELALANDE and PRUDHOMME, 379.—On a cerin of the Aro- 
matic Series, GRIMAUX: Wenients of Physical Manipulation; by EDWARD ARD C. 
logy Natural History.—Results of the Earth’s contraction from Cooling, 
381.—United States Geological Survey of the Territories under the Department 
of the Interior, F. V. HAYDEN, 382.—Sphagnum as a Pea t-maker, 383. 3—Chall- 
i are LaRreT a and HENRY 
ole mn the Meteors of November 14t th; by DanrEL KrirKWwoop: 
tly discovered Comets, 392.—Spectroscopic observations of Borelly’s and 
Try 8 ; Comets, 3 
“elon tie Ta "Fate telligence.—Deep Sea eae 394.—On the Electrical 
henomena which accompany the Contractions of the Leaf of Dionzea musei- 
Rane by Dr. Burpon-Sanp “rg 396.— yeeros Mount Whitney by Messrs. 
oh Crapo, Hunter and others; by W. re GoopyEAR: Annual Report of the 
d of Regents of the Smithsonian ee for the year ba : Late — 
a the American Asso n, 397.—Oritiques and Addresses y T. 
Huxiey : Scaats paecess ey ROBERT Maxuwt The Unity of Natural P Phe- 
Whit Comets and gg stad by DANIEL RKW , — Obituary.—: 
te ‘iso emg Prof Prof ar on 398. 
. . Coste: 
APPENDIX.—Star Panbeeraghin of ‘Cordoba; by B. A. GouuD 
—_—_+e0—_—_ 
NUMBER XXXVL 
Arr. XLIV.—O hy; b 
| Haar Dnahen, Diffraction setae Photography ; aa ne 
eee aE ae ee me re 
409 
eae oe 
iat oe a ee ee -_< 
