when produced and at right angles to the meridian passes through the 
a Wheatstone’s rheostat which forms part of the circuit. If » and ¢’ 
represent the angular deviations of the two magnetic needles, then for 
eS ; tan 9 '< 
the same series of experiments ane must be constant in case the as- 
sumed proportionality between the intensities of the inducing current 
and of the induced magnetism, holds good. he iron bars employed 
were cylindrical, and their surfaces were turned smooth to remove the 
layer hardened by hammering. The results of numerous careful de- 
Pee . tang, % 
terminations show that the ratio aaetet ceteris paribus constant, and 
consequently confirm the law of Lenz and Jacobi. [The authors 
attribute the opposite results obtained by Miller partly to the manner In 
von Feilitzch yield some support to Miller’s view, and certainly 
render a thorough investigation of the whole subject desirable 
: c 
. 
The gas absorbed consists therefore of olefiant gas, (acetene), 
Propylene C,H,, and butyrene C,H, ; the unabsorbe portion pod) 
4 
A 
oO 
Q. 
g, 
o 
Set 
oO. 
= 
j=) 
4) 
S 
2 
S 
Q. 
5 
pS 
= 
2) 
i 
egan to boil at 105° to 106°, the last portions distilled between 135° 
and 140° ; the portion boiling 6 
of 0-708, at 16°, the density of its vapor was 3954, which leads to the 
formula C,,H , ,=4 vol. vapor. With bromine this liquid gave a heavy 
fluid compound, C,¢H,,Br.—=4 vol. vapor, whieh is therefore a homo- 
logue of the preceding. ‘The author has obtained similar results with 
see caprylic, enanthylic, margaric and ethalic acids; all of these gave 
% liquid carburets of hydrogen of the form Cm Hm as well as the gases 
C.H,, Ce : 6 Cg 
rbu 
eH H,- After recalling the analogous results obtained 
ih valeric acid, the author concludes, that setting out 
the homologues of marsh gas (palene) do not possess 
Chemistry and Physics. 1OY: 
center of the needle. The force of the current is varied by means of 
