468 Natural-Philosophical Collections. 
confidence which it has inspired in the commissioners is such, that they are ‘coms 
vinced that at 50 atmospheres the error would not be 0.1. The temperatures for 
the pressures above 24 atmospheres, have been calculated up to 100, but only 
from five to five. We here give the series of numbers extracted from the table 
presented to the Academy. 
Elasticity of steam, Corresponding tempe- 
taking the pressure ratures given by the 
of the atmosphere centigrade thermome- 
for one. ters. 
1 * - 100° 
1} * = 112.2 
2 = = 121.4 
22 - - 128.8 
3 = 2 135.1 
33 - - 140.6 
a - = 145.4 
4k “ - 149.6 
5) - = 153.8 
5L S “ 156.8 
6 - - 160.2 
6z = = 163.48 
7 - - 166.5 
74 = - 169.37 
8 - < 172.1 
9 2 = Viet 
10 - - 181.6 
il = = 186.03 
12 « - 190. 
13 - - 193.7 
14 - = 197.19 
15 = - 209.48 
16 - = 203.60 
17. - - 206.57 
18 = - 209.4 
19 = - 212.1 
20 - - 214.7 
21 = - 217.2 
22 - . 219.6 
. 20 - - 221.9 
24 - - 224.2 
25 - - 226.3 
30 - af espa 
30 - - 244.85 
40 = - 252.53 
45 - > 259.52 
_ 50 = = 265.89 
Extract from the Analysis of the Labours of the Academy of Sciences during 
the year 1828; by Baron Fourier. ( Continued. )—M. Chevreul presented a 
memoir, which will be published in the ninth volume of the collection, and of 
which the title was as follows: On the optical influence which two colowred 
objects may have on each otherywhen they are seen at once, and of the neces- 
sity of taking this influence into consideration in the art of dyeing, in order to 
judge of colours, without reference to their solidity. 
It has long been remarked, that in certain cases the eye sees a coloured body 
of a different colour from that which is attributed to it when it is seen separately, 
