140 On an Apparatus for Restoring the Action (f' the Lungs. 
of the lungs ; and as a drop or two of ether might 
be occasionally useful as a stimulant^ (since it appears that 
a mixture of etherial vapour and atmospheric air produces 
all the effects of nitrous oxide), it may be conveniently ap- 
plied through this appendage. 
D, is a bladder and stop-cock for the occasional administration 
of oxygen or nitrous oxide. 
E, is a flexible hose, similar to that in the common apparatus, 
with a stop-cock to cut off or restore the communication at its 
entering the larynx, and is a perforated tube, with a safe- 
shield which closes the vent^ and that tube is maintained in 
its place by this fixation of a ribbon round the head of the 
victim of suspended animation. 
Cy is a valve resembling the key of a flute, and operating similar- 
ly ; for, by pressing the farther end of the lever, the aper- 
ture is uncovered, and, by a spring, it recovers its wonted 
place. It serves to empty the Cylinder occasionally, and^ 
prior to the re-supply of new air from the attached air-cy- 
linder. 
dy is a curved canal, uniting the space below the valve with that 
above it, when the piston ascends to the dotted line g. is 
a joint, by which the tube is made to slide into itself like the 
tubes of a telescope, and thus regulate the size of the volume 
of air for lungs of any required capacity. 
^y is the button-valve, which is raised by the air escaping from 
the lungs, and Ailing the space prepared by the ascending 
piston ; and the same elevation of the valve uncovers the ori- 
fice of the canal hy and the air rushes through it so soon as 
the piston-rod mounts to gy and fills up the space which ob- 
tains between the orifices at the dotted line g and the valve e. 
From this description, the mode of using the apparatus must 
be evident. 
