Astronomy. 1538 
misled Pouillet regarding the temperature of the solar surface, 
which he computed at 1,461° C., or at most 1,761° C. i 
well to bear in mind that Pouillet had himself ascertained with 
d 
on the surface of the earth; and also the retardation suffered dur- 
per minute for each square foot of the surface of the sun. Con- 
sidering the imperfect means employed by Pouillet, his “ pyrhe- 
liometre,” the exactness of his determination of solar energy is 
temarkable. The truth is, however, that the near approach to ex- 
acthess was somewhat fortuitous, the eminent physicist having 
olu 
that an intensity of 1,461° ©. or 1,761° C., could not possibly 
. : 
Sainte-Claire Deville concludes his essay on so ar temperature 
thus :—« Ty ith my first estimate I believe that this 
en numbers which result from the experiments of M. Bunsen, and 
°se published long ago by M. Debray and myself.” The Krone 
a ans then agree that the temperature ©: 3 
"°€S Not exceed the intensity produced by the combustion of 
