G. A. Liebig—Specific Heat of Water. 57 
Art. VITI.—On the Variation of the Specific Heat of Water ; by 
G. A. Lixzsie, Student of Physics in the Johns Hopkins 
University. 
Unt the year 1877 it was generally believed by Hinlag ea: 
f increased regularly from 0° to 
of temperature, but decreased from 0° to a minimum at about 
30°. In 1882, F. Neesen,t of Berlin, investigated the sub- 
ject, deducing the variation of the specific heat of water 
from the specific heat of platinum, which he had previously 
determined ; and although his results are not quantitatively 
the same as Rowland’s they are so qualitatively, i. e. they show 
that the specific heat of water decreases from 0° to a minimurn 
somewhere near 30°. Owing to the general interest and im- 
portance of these conclusions, I have, at the instance of Pro- 
fessor Rowland, undertaken during the last few months a new 
series of experiments. The apparatus used was that devised 
and employed by him in his researches, and the method of 
procedure was also as nearly as possible identical with his. 
The two thermometers (Nos. 108,947 and 108,954) necessary 
for the work were made by Hicks, and graduated in mil-— 
limeters. They were carefully calibrated and compared with 
made of English glass are characterized by this roperty. 
aa “4 od can be had 
* Mech. Equiv. of Heat, Proc. Am. Academy Sciences, 1880. : a8 
+ Ann. Physik u. Chemie, neue Folge, vol. xviii, 1883. oe 
These—Nos. 6.163 and 7,832—were made by Baudin, and had frequently 
been Compared with the air thermometer. No. 6,163 was used by Professor Row- 
land in his before-mentioned research re 
