~ 
Chemistry and Physics. 485 
the chlorine, carbon and oxygen atoms in any molecule and thus 
to formulate a substance which, if it could exist in the free state 
eee have the same capillary constant as the original body. 
ce, two substances having the same value for N, ma 
means of these equivalents be represented by the same number of 
hydrogen atoms. Thus CH,O=H,, the value of N being 59°8; 
C,H,O,=H,,, N be coh 20°4 ; ‘CH, O=H,, N being 8°7; and 50 
on. If a curve be drawn’ with these hy drogen values as ordinates 
and the cotnes ponding, nalias of N as abscissas, then ahay seta 
havitig jk any substance containing C, or ts formula 
may, by using the above equivalences, be tranclated. inte its hy- 
drogen scniealien and then from the curve, its capillary con- 
stant be obtained. In other words, from the molecular formula 
calculated. Since N=$a’—v, the value of either @ or v (the 
he 
calculated and observed values of N as given in the paper are 
very close. With regard to the equation of the curve, which is 
concave toward the axis of abscissas, the author finds it to be 
y= _ PSM -VOTESS the equation of a logarithmic curve. A 
complete table of the liquids tested, their formulas and values 
of a*, ta’s, and N, concludes the paper. — Liebig’s Annalen, 
eexxiii, 47, March, 1884. 
On. the Discovery of the Periodic Law and on Relations 
among the Atomie weigh a; ay Jonn A. R. N EWLANDS, F 
pp. 12mo. 
t 
which he anticipated Mendelejeft i in the latter’s subsequent devel- 
opment of the same subject. The book - a er oat scares as a 
Sarasin, have. studied the absorption spectra of the water taken 
from different localities. The water was contained in four tubes 
of glass 1°10 meters in length, and 0°05 meters in diameter. One 
of these tubes did not produce a sensible absorption in the solar 
Spectrum. But with two tubes, that is with a length of a little 
over two meters, an obscure band appeared in the orange. This 
band was very feeble and narrow. It was a little tens refrangible 
than the D line and corresponded very nearly with the cheb 
a 
