Apparatus for restoring suspended Respiration. 169 
gases in tin plate vessels, and have invariably found that the ves- 
sels were torn open without the least danger to those present, as 
stated in my last communication. 
In all the experiments above alluded to, I have used a mixture 
of nine parts by measure of hydrogen, and four parts of oxygen 
(prepared from hyper-oxymuriate of potash). 
In justice to myself, and with reference to Mr. Murray’s letter 
to you accompanying my paper, allow me to observe, that though 
Mr. Murray recommended the mercury in preference to oil or 
water, both the safety-cistern, and valve therein described were 
entirely my own invention ; and neither suggested by nor modified 
from any plan of that gentleman’s, 
1 remain, sir, 
Yours most obediently, 
H. B. Leeson. 
XXXVIII. Description of anew-Apparatus proposed for restoring 
the Action of the Lungs in Cases of suspended Respiration. 
By J. Moors, Jun., Esq. 
To Dr. Tilloch. 
Sir, — Havine observed, in your Number for October last, a 
drawing and description of an apparatus by Mr. J. Murray, 
wherewith the action of the lungs might be restored, and having 
also a plan to effect the same desirable object, which I consider 
more complete that than gentleman’s, as it does not require 
turning a cock to admit fresh air, but every time the pistons are 
raised and depressed not only gives a fresh supply to the lungs, 
but also withdraws the air which has been injected ; I presume 
you will have the goodness to insert the following in your 
Magazine. 
Let fg. 1 (PI. III.) represent a common air syringe with a solid 
piston, but thus differeutly formed, that at the bottom of the cy- 
linder there are two tubes, as A and B, either flexible or otherwise, 
each tube having a valve, that of A having its valve at C to open 
outward ; and B having its valve at D to open inward. 
Now suppose there be two of those syringes placed side by 
side as at fig. 2, the tubes together; thus, A in the one syringe 
must be placed by the side of B of the other, placing the tubes 
together, whose valves open contrary to each other, 
In order to try the efficacy of this plan, have a common 
bladder, and into the neck of it pass either of two tubes which are 
connected, and let the piston handles be fastened together; then, 
as you raise and depress them, the bladder will expand and con- 
tract: you will perceive that by the upstroke of the pistons, the 
Vol. 59. No, 287, March 1822, Y air 
