OF FOODS UPON THE EESPIEATION. 
737 
12. The proportion of the carbonic acid to the quantity of air inspired was always 
increased at the period of maximum influence. 
13. Mr. Motjl experienced much greater efiect from tea than myself. He is exceed- 
ingly fond of tea, is not fond of coflee, and dislikes acids, and in the above experiments 
the results corresponded. 
14. The influence of both tea and coflee is exerted almost immediately, viz. in five 
minutes, and the maximum is attained in from twenty-five to sixty minutes. The 
duration varies from one to two hours. In all these particulars there is a variation in 
diflerent persons. 
16. With tea we frequently found nausea in ten minutes, and sometimes to a very 
unpleasant degree, but it left in ten or fifteen minutes. There was also a soothing or 
narcotic eflect at fii’st on several occasions, and when it had been taken with an alkali 
this eflect was continued to the end ; whilst on the other hand the influence was more 
stimulating with the acid. There was great freedom of inspiration, and sometimes of 
expiration also, in about forty to seventy minutes, and with this there was a feeling of 
lightness and clearness. The pulse was always soft, and the skin moist or soft. 
16. With coflee there was no nausea or soothing; the pulse was sometimes feeble, and 
the pulsation in the head and hands more perceptible. There was often an uncomfort- 
able sensation in the small intestines and forcing at the rectum, and not unfrequently a 
sense of constriction about the diaphragm in from sixteen to forty minutes. There was 
more action upon the Iddneys than ■with tea. The skin was often hot and dry. 
17. Coflee leaves caused the hands to be hot in seven minutes when 1 oz. had been 
taken, and in thirty-five minutes a purring sensation occurred similar to that with 
alcohol, and a not unpleasant feeling of listlessness. The eflect was narcotic in thirty- 
seven minutes. 
7. Some other Nitrogenous Substances. 
Albumen. ^April 9 (8 exps.). Two good-sized boiled eggs gave Mr. Moul’s son an 
average increase in carbonic acid of '27 gr., and a maximum of '88 gr. per minute. The 
maximum increase in the quantity of afr inspired was 17 cubic inches per minute. 
On another occasion, April 21 (6 exps.), Plate XXXVI. fig. 57, my increase in carbonic 
acid ^vas an average of ‘45 gr. and a maximum of 1‘12 gr. per minute, whilst in Mr. Moul 
they were 13 gr. and 38 gr. per minute, respectively. I had a decrease in the quantity of 
air, whilst Mr. Moul had an increase of 38 cubic inches per minute. My rate of respi- 
ration scarcely varied, but Mr. Moul’s fell, as did also his pulsation in a slight degree. 
Gelatin. May 8 (6 exps.). The eflect of 120 grs. of pure dry isinglass prepared with 
12 oz. of water, gave to myself and Mr. Moul an average increase in carbonic acid of 
43 and ‘14 gr., and maxima of ‘84 gr. and 66 gr. per minute respectively. On another 
occasion. May 21 (7 exps.), 100 grs. of dry commercial isinglass gave to myself and 
Mr. Moul an average increase in carbonic acid of *14 gr. and *26 gr., and maxima of 
76 gr. and -92 gr. per minute respectively. I had no increase of air in the first expe- 
MDCCCLIX. 5 
