380 On the Heat in the Sun’s Rays. 
| No. of obs. Temp. of air. Temp, in sun. Diff. sage som: 
1 40 46 6 6 
- 50 6 10 
3 48 56 8 16 
4 50 60 10 20 
5 54 66 12 26 
6 58 40 12 80 
- 63 80 17 40 
8 70 90 20 50 
9 48 100 22 60 
10 83 106 23 66 
11 88 110 22 50 
I 120 22 80 
18 102 124 22 aca 
14 108 130 22 90 
ist. That the heat in the sun’s rays is not uniform, such as 
would proceed from a great heated body of uniform intensity, 
nor is it such as was received from the canister, when kept at the 
same degree of heat, but that it varies and is dependent upon 
the temperature of the air. 
2ndly. That the effects of the sun’s rays upon the thermometer 
at the different degrees of heat in the receiver is the same that 
has usually been observed at similar temperatures in the open 
air. Itis easy by changing the heat within the receiver, to mml- 
tate the power of the sun’s rays that has been observed at any 
time or in any place; indeed at the same time, the same rays may 
haye in one receiver the burning heat of a summer’s sun, and in 
the other only the feeble action of winter. 
3dly. It appears that heat does not travel along with the rays 
of light as has been usually supposed, but that it is received, or 
parted with, lost or acquired, according to the temperature of the 
Each planet 
may be suppoeed to possess its own atmosphere of heat: this will 
y the sun’s light as the heat within the receiver 
was affected; but they need not be frozen by their great dis- 
tance, nor burned by their near approach to the great faminary ie 
i IE pee oS te See ae ae Ed PY eel Rae eee 
