175 
quence of over-crowding, finds some of its sustenance in the 
impure vapours arising from the lungs and the general surface of 
the body.” 
I understand him to mean by this that diseases are not only 
produced by these organic emanations, but that they are sustained, 
encouraged or spread. 
In Table IV. I am able to show the amount of carbonic acid 
in various close places in London, according to Dr, Angus Smith.* 
TaBLe IV. 
Per cent, per volume. 
Chancery Court, closed doors, 7 feet from laceae 5a a 0:193 
Do. 3 feet from ground th So ae 0:203 
.Do. doors wide open, 4 feet from ground, aie 40 2 aeMey eee nO,0007) 
Do. 12-40 p.m., 5 feet from ground iy ser ae 0:045 
Strand Theatre, Gallery. TOGpsxns eee. wis a a8 0-111 
Surrey Theatre, boxes, 7-12 p.m. ... sl es aes 0:218 
Olympic, 11-30 p.m. ... “ne no if 4}. eine 0:0817 
Do. 11-55 p.m. sa bas a 3 Bes 071014 
Haymarket Theatre, 11-30 p.m. eh sxe mi a: 0:0757 
Victoria Theatre, boxes, 10 p.m... . “oe 0°126 
Queen’s Ward, St. Thomas’s Hospital, 3- 25 1 P-tic.. <3 0-040 
Edwards’s Ward, St. Thomas’s Hospital, 3-30 p.m. Ss 0:052 
Pavilion, 10-11 p.m. (Whitechapel) ... nee ish ne 0°152 
City of London Theatre, pit, 11-l5 p.m. ... ae sins 0°252 
Standard Theatre, pit, 11 p.m. bis be Am 2h 0°320 
Observing that the amount of carbonic acid in fresh country air 
is not more than o’o4, but generally rather less, and comparing 
the above, we see the differences as regards carbonic acid between 
good country air and that of the London Law Courts and Theatres. 
Thus, the air of the Chancery Court contained about five times as 
much as good country air; that of the Strand Theatre, eight ; City 
of London Theatre, over six ; and the Pavillion nearly four. 
The organic matter in expired air bears considerable relation 
to the carbonic acid also present, so that the increase of carbonic 
acid may be taken as showing a corresponding increase in the 
organic matter. Medical authorities of the highest standing give 
_ it as their firm opinion that these products of respiration, when 
* This must, of course, be understood to apply to the places mentioned 
only at the time the observations were made, (Ed.) 
