Intelligence and Miscellaneous Articles. 313 
TABLE IV. 
Light in terms of 
Name of candle. fe Esa that emitted by the 
burnt per hour. Standard candle. 
Standard candle ... 7°82 1:00 
1st Sperm ,, ide Doubtful 1-14 (?) 
2nd. _,, ds a0) 6°102 1:00 
ord_s,, 7 on 7-188 1:00 
4th _,, be He 7°29 1:02 
oe 2 ie al 1:02 
Gh. .,, ps aie 6°84 1-05 
idle Fa ee 6:66 0-99 
These tests of candle-power were not made with any very 
high degree of accuracy; but the comparison of these No. 8 
sperm-candles with the standard was carried out with probably 
quite as much accuracy as is employed in making ordinary 
22 experiments on the luminosity of incandescent 
amps. 
——————————— 
XXXV. Intelligence and Miscellaneous Articles. 
ON THE LIMIT OF THE DENSITY AND ON THE ATOMIC VOLUME 
OF GASES, AND PARTICULARLY OXYGEN AND HYDROGEN. BY 
EK. H. AMAGAT. 
(ee recent researches on the density of liquid oxygen by 
. MM. Cailletet and Hautefeuille, Pictet, and by Wroblewski, 
have led to values all of which are less than unity, in the different 
conditions in which this density has been determined. It has been 
concluded from this that, in agreement with the previsions of 
Dumas, it will be equal to unity under a sufficiently powerful 
pressure, or a sufficiently low temperature, and that accordingly 
the quotient of the atomic weight by the density, or the atomic 
volume, would be virtually the same for oxygen, sulphur, selenium, 
and tellurium. . 
In my second memoir on the compressibility of gases under 
strong pressures (Annales de Chimie et de Physique, 5th series, 
vol. xxi. 1881), I showed that at sufficiently high temperatures 
the law of the compressibility of gases is ultimately represented by 
straight lines which correspond to the ratio p=(v—a@)=constant, 
which at once gives the limiting volume a tor p equal to infinity, 
and therefore the limiting density ; and that for lower pressures 
the curves, starting from a considerable pressure, exhibit a portion 
which is virtually rectilinear, and by which we can calculate, though 
with less certainty, the limiting volume™*. 
* In this memoir I have used the term atomic volume to denote the 
value of a in reference to one litre of gas at zero, and under a pressure 
of 76 centims. I make this observation to avoid any confusion. 
