; 
Soe 
. 
CONTENTS OF VOLUME XLIX. 
NUMBER CXLYV. 
Art. L—Alexander von Humboldt, his early life, his educa- 
tion, his writings and his books; by Henry SrEvens, . 
I*.—Livingstone’s African Explorations, ........++-++-++++ 
I.—On the relation between the Intensity of Light produced 
from the combustion of Illuminating Gas and the vol- 
ume of Gas consumed; by B, Smiiman, .....--+----- 
UL—Principles of — and Cosmical Physics; by W. 
A. NORTON, 22.8. 50 ce ccc cece cere cece e nee eeeceeees 
IV.—The Phutondinepers by Henry M. Pinnuvaer, gees 
V.—On the Crater of Haleakala, Island of Maui, Hawaiian 
Group; by W. D. ALEXANDER, ..--.+++++-++eeeeeees 
VI.—On a new method of separating Tin from Arsenic, Anti- 
and Molybdenum; by Frank WiceLeswortH 
Crates is cs rank hee i ds Snes SE eS ee 
VIL—_Notes on the structure of the Crinoidea, Cystidea, and 
Blastoidea; by E. BmLinGs, .....---++-++++eeeeeeeee 
VIII.—Upon a new Spectroscope, with Contributions to the 
Spectral Analysis of the Stars; by J. C. F. ZOLLNER,. - 
1X.—Polarity and Polycephalism, an essay on Individuality ; 
by H. James CLARK, ..-.---- eee enceeceerererreeces 
X.—On Laurentian Rocks i in Eastern Massachusetts; by T. 
Greeny HUnT, .....---ee cece eres ett tee ee ees 
XI-—Contributions to the Chemistry of Common Salt: with 
particular reference to our home ee by GAS 
GOESSMANN, «.-cesee-seccerrscrcessensceens astbise > 
XIL—Account of a fall of Meteoric Stones near Danville, 
— Le, vt LAWRENCE 
eee eee reer ere ee ee 
cee CR ee ¢ oe eS ee 
Caan 
: a TEESE by AE. a wc ntereccesess 
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