PROFESSOR KOPP ON THE SPECIFIC HEAT OF SOLID BODIES. 
177 
The first formula is that of one constituent of bees’ wax, cerotic acid ; the second 
is that of the other, palmitate of melissyle. In reference to the numbers found for the 
specific heat of bees’ wax at higher temperatures, compare the last remark in § 77. 
Atomic Specific Atomic 
weight. heat. heat. 
~ ^ 049 f Crystallized cane-sugar . . . 0-301 Kp. 102-9 
12 22 H • • 0 | Amorphous cane-sugar . . . 0 - 342 Kp. 117-0 
€ 6 H 14 0 6 .... 182 Mannite 0-324 Kp. 59-1 
0 4 H 6 0 4 .... 118 Succinic acid 0-313 Kp. 36 - 9 
0 4 H 6 0 6 .... 150 Tartaric acid 0-288 Kp. 43-2 
€ 4 H 6 0 6 +H 2 0 . . 168 Racemic acid 0-319 Kp. 53-6 
O 2 H 2 Ba0 4 . . . 227 Formate of baryta .... 0-143 Kp. 32-5 
0 2 K 2 0 4 +H 2 0 . . 184-2 Neutral oxalate of potass . . 0-236 Kp. 43-5 
0 4 H 3 K0 8 +2H 2 0 . 254-1 Quadroxalate of potass . . 0-283 Kp. 71*9 
0 4 H 5 K0 6 . . . . 188-1 Acid tartrate of potass . . . 0-257 Kp. 48-3 
€ 4 H 4 NaK0 6 +4H 2 O 282-1 Seignette salt 0-328 Kp. 92-5 
0 8 H lo 0a0 lo +8 H 2 0 450 Acid malate of lime . . . 0-338 Kp. 152-1 
The preceding Tables contain the material, obtained experimentally, which serves 
as subject and basis for the subsequent considerations on the relations of the specific 
heat of solid bodies 'to their atomic weight and composition. 
PART Y.— ON THE RELATIONS BETWEEN ATOMIC HEAT AND ATOMIC WEIGHT OR 
COMPOSITION. 
90. I discuss in the sequel the regularities exhibited by the atomic heats of solid 
bodies, the exceptions to these regularities, and the most probable explanation of these 
exceptions. In regard to the views which I here develope, much has been already 
expressed or indicated in former speculations ; in this respect I refer to the first part 
of this paper, in which I have given the views of earlier inquirers as completely as I 
know them, and as fully as was necessary to bring out the peculiar value of each. It 
is unnecessary, then, to refer again to what was there given ; but I will complete for 
individual special points what is to be remarked from an historical point of view. 
But before discussing these regularities, the question must be discussed whether the 
atomic heat of a given solid substance is essentially constant, or materially varies with 
its physical condition. It depends on the result of this investigation, how far it may 
with certainty be settled whether the general results already obtained are of universal 
validity, or whether exceptions to them exist. 
The specific heat of a solid body varies somewhat with its temperature ; but the 
variation of the specific heat with the temperature is very small, provided the latter 
does not rise so high that the body begins to soften. Taking the numbers obtained by 
Regnault for lead, by Dulong and Petit, and by Bede and by Bystkom, for the specific 
heats of several metals at different temperatures, the conviction follows that the changes 
of specific heat, if not of themselves inconsiderable, are yet scarcely to be regarded in 
comparison with the discrepancies in the numbers which different observers have found 
2 b 2 
