for restoring the Action of the Lungs. 277 
is an instrument but ill calculated for that important purpose. 
it would, however, not become me to condemn: I rather wish 
to submit an invention which it is humbly conceived may be used 
with success. 
In No. IX. of the Edinburgh Philosophical Journal is a drawing 
of the apparatus as perhaps best adapted for houses of recovery. 
Herewith [see Plate IV. fig. A.] is a sketch taken from a portable 
form of that invention as executed for me in Britannia metal, by 
Messrs. Dicksons and Smith, of Sheffield. The arrangement is 
somewhat modified in one transmitted by me to the Royal Hu- 
mane Society. In this there are éwo belts, at proper distances 
terminating in screws which fasten by means of nuts to a flat piece 
of board, and a clamp fixes the whole securely to a square table. 
The drawing now submitted exhibits two cylinders concentric 
with each other, the inner one three inches diameter, and the 
exterior one fowr inches, forming a partition of half an inch be- 
tween, which is supplied with water heated to 98° F. (the ani- 
mal temperature), to elevate the air included in the interior cy- 
linder to that grade. 
The piston is solid, and moves horizontally, and the piston 
rod is perforated to receive a metallic pin, which being checked 
by the plate covering the end of the cylinder gives us the means 
of apportioning the volume of air to the capacity of the lungs, 
which is to be determined by the victim of experiment being of 
tender age or adult. This will obviate the danger of rupturing 
the lungs. 
To the pipe proceeding from this cylinder is affixed a cell and 
cock, with an elastic tube terminating in a mouth-piece and 
plate of leather. 
The stop-cock is so constructed, that when the handle is pa- 
rallel with the pipe, as in the figure, there is a free communication 
established between the lungs and the cylinder, to the exclusion 
of external air; when, on the other hand, the cock is turned the 
quadrant of a circle, the communication with the lungs is cut 
off, and there is a free channel opened between the cylinder and 
the external atmospheric air. 
The lateral cell appended to the cock will be found of varied 
use and importance. Should the subject of experiment have 
been the victim of carbonic acid gas (choke-damp), a drop or 
two of ammonia will mingle with the atmosphere of the cylinder 
and condense the mephitic gas; and if a septic poison (as sul- 
phuretted or arsenicated hydrogen) have occasioned the asphyxia, 
a few drops of solution of chlorine or nitromuriatic acid will 
destroy that septic virus. Should the atmosphere be too dry, a 
small portion of water put into the cell will mix with the air, and 
impart additional elasticity; and if we desire an additional eee? 
a drop 
