CONTENTS. vii 
NUMBER LXIX. 
Azr. XXXI. Remarks on the Huronian and Laurentian Systems * 
of the Canada Geological Survey; by J.D. Wuitney, - 305 
XXXII. Notice of a Photometer and of some experiments there- 
with upon the comparative power of several artificial means 
of illamination; by B. Sintiman, Jr., and Cuas. H. Porter, 315 
XXXII. Researches on the Ammonia-cobalt evi: by WoL- 
cott Giggs and F. A. Genru.—Part I, - 219 
XXXIV. Earthquakes in California se the year 1856 ; : De. 
J.B. Teas, - 341 
XXXV. On the Pi. of ore as the Sotore of the 
Liquidity of Lavas; by G. Pouretr Scrorz, — M.P., 
fm. P On. = 
XXXVI. On the Climate of oe tice ‘“ ee of Me. 
teorological Records of the year 1856, at Muscatine, Jowa, 
with a Synopsis of the records of the seven ames from 1850 
to 1856, inclusive ; by T. S. Parvin, : 
XXXVII. Statistics of the Flora of the Northern United aes ; 
by Asa Gray, . 
XXXVIL. On the Meridian Coantitth of the Daley Obsera 
tory; by Dr. B. A. Goutp, - 
- On two Sulphurets of Copper tree ‘i Catena (a) 
Mine « by N. A. Prart, Jr, - : 
XL. Contributions to Mineralogy ; by Dr. Jeena Pi Ganka 
XLI. On the Separation of Lithia and eae gie by J. w. 
Matter, Ph.D., - 
on 
: W ’ a 
SCIENTIFIC INTE ERIG EE en ‘a 
Chemistry aud Physics Electrodynamic measurements, 430 —On Boron, 433.—Notice 
of a supposed new case of Fluorescence, by Prof. J. W. Mauer, 434. 
* Geology.—Volcanic Action off Hawaii, by Rev. T. Coan, 435.—Geological Survey of 
hers by LA. Larnam: On the Reactions of the alkaline silicates, by T. Sreny 
Honr, 437. 
Botany.—Musci Boreali-Americani, sive Specimina Exsiccata Muscorum in Americe 
Rebuspublicis Federatis detectorum, conjunctiis studiis W. S, Sutzivant et L. 
Lesquergvx, 433.—Fungi Caroliniani Exsiccati, by H. W. RavenEL: First Lessons 
in Botany and Vegetable Physiology, by Asa Gray, 439, 
