68 P.E. Chase on the distribution of Heat over the Earth. 
T have heated several of my specimens of itacolumite to as 
certain whether any petroleum odor was evolved, but with nega- — 
tive results. Ifthe diamond proceeded from a slow and gradual 
oxydation of the hydrocarbon perhaps we should not expect to — | 
find any petroleum left. 
n this connection the small and rarely occurring black specks, ; 
seen with the microscope, are to be noted; are they minute black 
diamonds, and have they any relation to the experiment where — 
hed ? 
the agate mortar was so deeply scratche 
Bethlehem, Pennsylvania, April 6. 
satin 
Art. VIII.—On the Laws which govern the general distribution of 
ee over the Harth ;* and on Brewster’s Neutral Point; by — 
LINY EARLE CHASE. 
lar comparisons in my communication of Sept. 21, 1866. Ab- 
ar com: as 
sorption and radiation proceed at nearly uniform rates, therefore — 
acy of the sine-difference 
y reasons for this inference are the following: 1, the general : | 
‘* Abridged from the Proceedings of the Am. Philosophical Society, Feb. 1, 1867- y 
+ Proc. Amer. Phil. Soc., vol. x, pp. 261-269. Se F capadlalhy, tke 
at St. Bernard, and the general ana c ar Table rp ser 
