or FOODS UPON THE EESPIEATION. 723 
Liquor PotassaB in 12 oz. of water, gave me a maximum increase in carbonic acid of 
2-13 grs. per minute, and after 100 minutes the increase was more than 1 gr per 
mmute The maximum increase in the air inspired was 165 cubic inches per minute, 
m a little less than one hour. The rate of respiration was scarcely altered, but that of 
pulsation was lessened 7 per minute in hour. 
Cane-sugar and BuUer.—^vd^ 1 (8 exps.), Plate XXXV. %. 28. 750 ots. of white 
sugai, with 500 grs. of butter, and without water, gave a maximum increase of only 
P3gr. of carbomc acid per minute, of air 48 cubic inches per minute, and in depth of 
inspiration o-8 cubic inches. The pulsation was slightly increased 
2 (7 exps.), Plate XXXV. fig. 29. 500 grs.' of grape-sugar, dis- 
soHed in of hot water, gave a maximum increase in carbonic acid of 1-04 nr. per 
mmute in 55 mmutes; whilst on another occasion, July 8 (7 exps.), 750 grs. nave an 
mcrease of M gr. per minute in 50 minutes. The maximum increase in the quantity 
o air mspu-ed per minute was 8 cubic inches and 23 cubic inches. The rate of respira- 
tion was lessened, as was also that of pulsation, in the first experiment 
^iffi-aas-ar.-Juue 12 (7 exps.), Plate XXXV. fig. 20. 250 gi-s. of sugar of milk, 
in h 6 oz. of hot water, produced a maximum increase in carbonic acid per minute of 
L62 gr. m myself, and -66 gr in Mr. MouL. The volume of air inspired was increased 
24 cubic inches and 29 cubic inches per minute. The rate of pulsation fell, in Mr. 
- OUL 5 per minute, and that of respiration 1-6 per minute, whilst in myself the 
subsidence was to a less extent. 
Hence it is proved — 
1. That sugar m every form is a powerful respiratory excitant. 
2 The action is almost immediate, and it rapidly rushes up to a maximum, but the 
Whole effect does not disappear in less than from 1^ to 2 hours. 
3. WTien taken dry the effect is lessened, and the subsequent addition of water 
increases its action. 
i. In some conditions the addition of an acid increased the degree, but lessened the 
duration, of its influence, whilst that of an alkali had the contrary effect. The variation 
in these results is m accordance with the variation which I have found in the action of 
aci s am a a les alone. The contrast in the experiments on June 29 and July 5 is 
very striking. ^ 
5. The addition of fat lessened its action. 
than influence than cane-sugar, and grape-sugar has less influence 
7. The rate of respiration was always lessened, except when acid was added to the 
sugar whilst that of pulsation was sometimes increased, and particularly with acid and 
tat, but when an alkali was added, it was decreased considerably. 
The depth of inspiration was always largely increased. 
8. There was a sense of great ease and depth in both inspiration and expiration. In 
6 mmutes there was sometimes a sour taste; and although there was commonly at first 
5 c 2 
