170 = Apparatus for restoring suspended Respiration. 
air passes from the atmosphere into the one syringe, whilst the 
air contained in the bladder is passing into the other syringe: 
now, as the pistons are depressed, the airs which the syringes 
contain are thus disposed of: that syringe which drew air from 
the atmosphere injects it into the bladder, whilst the other sy- 
ringe which drew air from tie bladder, injects it into the atmo- 
sphere, and thus an artificial respiration is obtained, and a con- 
tinual supply of fresh air may be passed into the lungs; which 
might be either the common atmospheric air, oxygen, or any 
mixture, provided the proper tube be attached to the vessel 
which contains the gas. 
The various uses to which these syringes are applicable I will 
not minutely detail, but only mention briefly a few. First, ex- 
haustion by either syringe when separate. Second, condensa- 
tion. Third, exhaustion and condensation at the same time. 
Fourth, when the syringes are combined as above described, a 
change of the atmosphere which occupies the vessel in that to 
which they are attached. Fifth, if the two syringes are put to- 
gether, so that the A tube of each syringe shall be inserted into 
separate vessels containing liquor or gases, whilst the other tubes 
B B are inserted into a third vessel, as the pistons are worked 
the liquor or gases will be drawn from the vessel containing the 
tubes A A, and be mixed in the vessel containing the tubes B B, 
which may be applied as a gas-blowpipe. 
When the syringes are for the purpose of restoring suspended 
animation, it might be well to inciose one of them with a case to 
contain hot water, similar to the description given by Mr. J, Mur- 
ray; but I should also propose that the tubes A and B, which are 
to be placed into the mouth, have valves in them ; thus the tube 
A might have a valve near C to open into the atmosphere, which 
may be loaded or have a spring to prevent its opening when the 
lungs are not strained: but should a pressure be given which 
would be injurious to them, the valve would then open, and thus 
prevent it. The tube B, which also enters the mouth, may bave 
a valve near D to open inwardly, and be similarly loaded or re- 
tained by a spring, to prevent the rarefaction within the lungs 
from being so complete as to endanger a rupture of any of the 
small vessels. 
The same sort of valves may be applied to the breathing the 
nitrous oxide, so as to ensure its not passing to the Inngs a se- 
cond time, which I consider to be injurious to the individual per- 
forming the experiment. 
Let E (fig. 3) represent the lower part of a syringe with its 
tubes either flexible or otherwise, and having valves as before 
described. Let F be a mouth-piece. Suppose a bladder con- 
taining the gas be attached to the tube B, and an individual Ne 
the 
