214 i Analyses of Books [Marcu, 
from the constituents of the phosphates analyzed by Berzelius. 
There must, therefore, be an error somewhere ; and from the 
difficulties attending the analysis of the phosphates, and the 
many anomalies which they present, I am tempted to suspect 
that new experiments are requisite to make us accurately 
acquainted with the composition of these bodies. 
1 do not know whether it be worth while to remark, that Davy 
has adopted the very same numbers to denote the composition 
of phosphorous and phosphoric acid as I had done in the paper 
on phosphuretted hydrogen gas, so often referred to. I repre- 
sented these acids as composed of. 
Phosphorous AOU els n'pisan 0 1:5 phosphorus + 1 oxygen 
Phosphoric acid ......+++. 15 2 
Davy’s numbers are, 
Phosphorous acid. ........ 45 phosphorus + 30 oxygen 
Phosphoric acidy....... wen 40 60 
which are precisely my numbers multiplied each by 30. 
V. New Experimental Researches on some of the leading Doc- 
trines of Caloric; particularly on the Relation between the Elas- 
ticity, Temperature, and latent Heat of different Vapours; and 
on thermometric Admeasurement and Capacity. By Andrew Ure, 
M.D.—This paper, which is of considerable length, is divided 
into three parts. ‘ 
In the first part, we have a set of experiments to determine 
the elasticities of the vapour of water, and of other liquids, at 
different temperatures. The mode of conducting the experi- 
ments was ingenious, and it seems capable of more accuracy 
than any of the previous modes with which I am 
acquainted. It consisted of a very long glass tube, 
shut at one end and open at the other, and bent, as 
inthe margin. The glass vessel, A, was cemented 
round the shut end, and filled with water or oil, 
which could be heated by means of an Argand’s 
lamp. The liquid to be converted into vapour was 
put up into the sealed end of the tube; then mer- 
cury was poured into the tube till it stood in both 
legs at the same level, L/. The portion above / was 
filled with the vapour of the liquid. The tempera- 
ture in it was measured by a thermometer, and 
mercury was poured into the long leg of the syphon 
till the bulk of the vapour was reduced to what it 
was when the experiment set out. Thus the elas- 
ticity was measured by the height of the column of mercury in 
the long leg of the syphon. 
The following table exhibits the elastic force of the vapour of 
water at different temperatures, according to Dr. Ure’s experi- 
