152 Scientific Intelligence. 
IV. AsrTrRoNomy. 
1. On the Temperature of the Surface of the Sun; by J. 
Errcsson.—It will be recollected that Messrs. M. E. Vicaire and 
hare ah case read some papers before the Academy of 
Sciences at Paris last January, showing that the temperature of 
radiation ‘of a mass of fused iron weighing 7 ‘000 pounds, raised by 
i in rsh furnace to a temperature of 3,000° F., has 
between its temperature and that of the Sereniar medi 
Some eminent scientists, however, accepting Dulong’s conclusions 
and formula, assert positively that the stated assumption is incor- 
rect. In so doing they apparently eee the Rp insep- 
arable from the Newtonian doctrine, namely, that the conduct- 
ing power of the radiating body stiviita be e pertect ; eee at bet 
instant the temperature pervading the interior mass should b 
transmitted to the surface.* It needs no aeitisiiaerattoit to hve 
from that observed by nace and Petit. The investigation in- 
stituted by those experimentalists has in reality established only 
tain conditions, but by no means th rue radiant energy 
given temperatures. M. E. Vicaire and Sainte-Claire Deville, 
therefore, commit a serious mis in assu at the quantity 
high temperatures has been determined. It may be observed that 
the relation between the time of prc and the guantity of heat 
transmitted tf radiation which aa and Petit soy agi also 
2°75 posed of n hammere , charged with asa 
dls e ‘othe by a wheel applied within the sphere, revolving at a f 30 
rm nute, th al action of which brings the particles of the cen 1 
portion of the flui pidly i n the thin spherical shell, that the 
apparently absurd condition of perfect conductivity has been practically f Hed. 
u experim with this radiator, enclosed in ap 
exhausted vessel kept at a constant temperature, has homerppe that Ne 
law relating to radiant heat, up to a differential temperature of 100° Fahr. (beyond 
which the investigation has not extended), is rigorously corr correati< ote’ ubject will - 
fully di in a future article. 
