Chemistry and Physics. 501 
two others coincide nearly, the one with the water, the other with 
the alcohol band; another narrow and sharp from 566 to 570; 
showed the effect of progressively replacing hydrogen by the 
alcohol radical. Aniline, toluidine and dimethylaniline, and also 
turpentine were examined. The only liquids which did not show 
bands were carbon disulphide and tetrachloride—J, Chem. Soc., 
Xxxix, 168, April, 1881 
+ 
other. The openings at the two extremities were closed by mem- 
branes at right angles to the tubes. It was now expected that 
made before the first membrane, and 
‘gous to a simple sound wave, was obtained by the blow of a small 
t memobr 
read | . 
could be dropped through a given height against it; a second 
ball of glass, similarly suspended, rested lighty against the other 
rmi i it w 
ic as thrown by 
d 
ach corresponding deflection of the other ball noted ; 
‘he 
onds, and e : ss 
then one half of the system was turned 90° in the central joint, as 
