REPORT ON RADIANT MEAT. 
/"Nr i * J 
Case 
r-^ 
Inside. Outside. 
Most accelerated.bright.black. 
black.black. 
bright (3 cases) black, 
bright (3 cases) bright, 
bright (1 case) bright. 
Least accelerated .... black.bright. 
(2.) The coated vessel had its cooling in all cases retarded ; 
and in this order— 
Inside. Outside. 
Least retarded.black.black. 
bright .... black, 
black.bright. 
Most retarded.bright.bright. 
II. In air : both vessels in all instances had their cooling re¬ 
tarded by the cases. 
Mr. Fox also found the boiling of water in a bright vessel 
before a fire accelerated nearly doubly by a case blackened ex¬ 
ternally. 
He considers the results inexplicable, except on the hypothesis 
of an attraction between matter and heat. 
Mr. Fox has also communicated to me in manuscript, an 
account of some further experiments of the same kind on iron 
raised to a red heat, but which nevertheless are of such a 
nature as properly to come under this division of the subject. 
The precise temperature to which the iron was raised in each 
experiment was estimated by the remarkable cessation of its 
action on a magnetic needle at a certain stage of incandescence. 
The iron was inclosed in tin cases of two different sizes, 
within which the air could be exhausted, the inside being either 
plain or coated with lamp-black. 
The whole w r as immersed in water, and the temperature com¬ 
municated to the wnter in a given time, noted. After observa¬ 
tion the iron was plunged in water, and the residual heat thus 
communicated to the w r ater, noted. 
The general results were,—that in the smaller case the cooling 
w r as more rapid than in the larger; and in either the internal 
coating accelerated the cooling; in no case wns any material 
difference produced by exhausting the air. 
10.) Dr. Ritchie ( Edin. Phil. Journal , xxii. p. 281,) has shown 
that when a hot nonluminons body is placed between the two 
bulbs of a differential thermometer, blown out very large and 
thin, and both remaining plain, the liquid is stationary: the 
