VENTILATION OF HOSPITALS. 
699 
Table showing results of experiments upon Fibrin. 
Weight of 
Pepsin 
employed in 
Grammes. 
MAKE OF PEPSIN. 
A. 
B. 
C. 
D. 
E. 
0- 45 { 
1- 00 
1-50 
2*00 
3- 00 
4- 00 
5- 00 
,Digested 
Not 
digested 
Ditto 
Ditto 
Ditto 
Ditto 
Digested 
Not 
digested 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Not 
digested 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Not 
digested 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Not 
digested 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
Ditto 
We are now enabled to see — 
1st. That the relative digestive powers of A and B on fibrin 
are very nearly the same as those upon albumen, the ratios 
being 
10 A to 1 B on albumen; 
8*88 (in round numbers 9) A to 1 B on fibrin. 
2nd. That inasmuch as five grammes of fibrin were un- 
digested by equal weights of pepsins C, D, E, and F, these 
preparations are practically destitute of medicinal value.* 
Having shown, from the results of nearly three hundred 
experiments upon albumen and fibrin, that the pepsin dis- 
tinguished by the letter A is far superior in quality to that 
of any other make, it appears to me simply an act of duty 
to the medical profession, and of justice to the under- 
mentioned firm, to state that it is prepared by Messrs. 
Bullock and Reynolds, of Hanover-street, Hanover-square.f 
In conclusion, I beg to thank my very able assistant, Mr. E. 
Lapper, for the aid he has rendered me during the prosecu- 
tion of this inquiry. — Lancet. 
August, 1870. 
VENTILATION OF HOSPITALS. 
A committee of the Paris Academy of Sciences is now 
considering this very important subject, and a communication 
from M. Cornill Woeystin has just been presented and re- 
* The fibrin remained undigested even at the end of twenty-four hours 
from the commencement of these experiments. 
f Dr. Pavy also showed in 1863 that the pepsin of Messrs. Bullock and 
Reynolds was much more active than that of any other maker. 
