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~ JOURNAL OF SCIENCE AND ARTS. 
es & ; 
a [SECOND SERIES] 
: _ Art. XV.—On the Nebular Hypothesis; by Professor DANIEL 
| IRKWOOD, Bloomington, Indiana. 
THE records of our planet’s physical history, from the dawn 
| he h of man’s creation, 
i have, for the most part, been brought to light since the com- 
mencement of the nineteenth century. Within this brief period 
. history as yet undeveloped; the grand out- 
lines of which must be ferived chiefly from celestial phenomena. 
t 
ard to the other. It must 
icle i ; han a sci- 
the present article is designed as a popular rather t 
entific discussion of this interesting subject, and we on its 
Pi tg will not be abated by the fact that a portion of the mat- 
eee Wee presente nt a brie 
ew. We shall in the first place prese 
the origin and nature of Lapland theory; secondly, a connected 
AM. JOUR. SCL—sECOND SERIES, Vor. XXX, No. 89—SEFT., 1860, 
21 
