CONTENTS. Vii 
NUMBER XXIX. 
Arr. XXXVI — some of the ancient Glaciers of the Sier- ip 
ras; by JosepH LeConre. With a Map on Plate V,__ 325 
XXXVIL Eo RI effects ieee the Fis colt of os 
ides; by Wm. Ferret, - 
XXXVIIL—On the Origin of Mountains; : by ‘Jamzs D. Dana, oar 
XXXITX, Hes ce Automatic Filtering Apparatus; by Harvey 
WER ee cg ae 
XLL—The Salt deposits of Western Ontario; by Joun 
GIBSON, 362 
XLII.—Comparison ‘of the ‘Spectra of the ‘Limb and of the 
ay On of the Set — at the Sheffiel tific School ; 
s. 8. Has 369 
XL “Oonshaine on the ‘Physical Laboratory of Har- 
vard College——No. IV. Induced currents and derived 
circuits; by Joun Trowsrer.—No. v. eis a method 
of measuring induced currents; by F. H. Biezktow.—No. 
VI. On methods of determining the resistance of a bat- 
tery, deduced from Poggendorff’s mode of measuring 
Electromotive Forces; oe N. D.C. Dope, & sens 372 
AprEnpDix.—Notice of new Tertiary Mammals, by O. C. Marsn, 407 
SCIENTIFIC INTELLIGENCE. 
and Physics.—On the Action of Charcoal o 
0 a 
Jacost, 380.—Ozone and Antozone. Their History and Nature, etc., C. B. 
Elements of Natural Philosophy, W. To itm ad P G. Tarr, 381. 
Geology and Natural History.—Notes on the Island of Curagao, W. M. Gas, 382. 
Hill fossils identified among specimens from Idaho, F. B. MEEK, 383. 
—On the Probable Existence of Microscopic Diamonds, with Zircons and Topaz, 
a the Sands of Hydraulic Washings in California, B. Smimman, 384.— gap 
Wurtz 1 
tribution to the. Histo of ‘the Fresh pier Alge of America, H. Cc. 
Woop or a | 1872-73, 391.—Sachs’ Ferbock, 3d edition: The 
Expression of ‘a ‘maéueas in Man and Animals, C. DARWIN, 397. 
Astronomy.—On the variation in the diameter of the Sun, A. Szccut, 397. 
Sang’s pgm Fae : Obituary, Baron Liebig, 
