132 Scientific Intelligence. 
1837, p. 61, 62 and 152); but neon the mineral from the West 
Hartford trap, anthracite. He remarks that the coaly “iL Hane 
; furthe 
from the shale at Berlin, and the Latieuiietaal shales of Southbury, 
" " of : ni 
Percival recognized the igneous origin of the trap, and the fact 
that ~ pc ssic or “Second ary formations were formed from the 
debri the Primary rocks.” The remark with which he closes 
the ssc implies that he supposed the bituminous material to 
ave come from the same deep-seated source as the trap. Yet his 
facts, alk his special presentation of them, are so vest calculated 
to big that the So minous shale and corps are the sources 
way through these rocks, is brought out ea Mr. G. W. Hawes in 
this Journal, on page 56 of volume i ix, 1875. J. D. D. 
SCIENTIFIC INTELLIGENCE. 
I. CHEMISTRY AND PuHysics. 
is lighted on a small portion of an acs 
rupted plane boundary of a mass of rock, of the precise quality of 
that of Calton Hill, and after burnin rning: for a certain time is re- 
moved, the whole plane area of rock being then freely exposed to 
* This water I have supposed to have largely underlaid the Triassic formation, 
occupying spaces between it and the subjacent metamorphic rocks, and also to 
have existed in and among the strata of the formation—the beds being often porous 
sandstones and loosely united (this Repeseeg Be vi, — page 108); and if mainly 
from beneath the Triassic, it would ha in just before the bydro- 
carbon vapors. 
