434 Scientific Intelligence. 
likewise concludes that the Moon imparts to us no heat from an 
internal or cosmical source. Further, he infers that the diffusive 
power of the lunar surface is considerable, at least equal to that 
of the least colored of terrestrial rocks; and he finds that the 
lunar heat by reason of its large percentage of obscure rays is 
far more impressionable by atmospheric humidity than that from 
4.) Power ars.—The experiments upon this 
subject, commenced by Mr. Stone with the great Equatorial of 
the Greenwic rvatory, in the year 1868, and mentioned i 
faces must be exposed to precisely similar atmospheric influences. 
Mr. Stone therefore resorted to what in effect may be descri as 
a horse-shoe pile, the two faces of which being similarly presented 
: i 
} process the galvanometer indications were converted into 
Fahrenheit-scale equivalents. It was found that the heating effect 
of Arcturus, after allowing for absorption by the object-glass, was 
0-00000137 of a Fahrenheit degree; that of « Lyra bei out 
two-thi of this a ri re: 
