Chemistry and Physics. 335 
bubble films modifies in ‘an interesting manner the rate of thinning 
ofthe films. The liquid employed was either a solution of potash 
Soap In water or Plateau’s liquide glycérique containing a certain 
Proportion of niter to increase its conductivity. The films had 
the form of vertical cylinders—the upper and lower supports be- 
ing of platinum. The films were blown with air which was first 
dried and then passed over some of the soap solution in a wide 
tube so that the condition of the air inside the tube was ap- 
the film and the upward current to retard it.—Phil. Mag., 
1885, pp. 94-100. J. T. 
8. On the Conduction of Electricity in rarefied air.—It has 
been maintained by Ep.iunp in various papers that what is called 
plati 
trodes were used. Phil, Mag., Feb. 1885, pp. 125-131. 3. 7. 
9. Measurement of Rotation of plane of polarization of liquids 
various 
: be us 
strong currents. Leo Arons has redetermined Verdet’s constant 
for this purpose, and believes that his result for distilled water at 
23° C. and the wave-length of the sodium line, namely, 
+ 4 
w=0°3767.10 ° cm * g * sec 
ble a : 
pable of being produced by the action of gravity in a movin, 
ler could be obtained.” Ban of ice were passed through holes 
