734 
DE. E. SMITH OX THE ACTIOX 
water, and the whole carbonic acid exhaled by him during the inquiry was collected 
and weighed every five minutes. The basis quantity was again reached aiter sixty-fi've 
minutes. On the whole average the increase in the carbonic acid was ‘79 gr., with a 
maximum of 1-24 gr. per minute. Thus the excess of the carbonic acid exhaled over 
the basis quantity was 61 '35 grs., or only one-fourth of that resulting from a smaller 
quantity when divided and taken at intervals. The maximum increase in the quantity 
of air inspired was 92 cubic inches per minute, and the greatest increase in both the 
carbonic acid and the air occurred in the first half of the period of inqrrhy. The rate 
of respiration was increased in the first three examinations. 
May 22 (7 exps.), Plate XXXVI. fig. 33.— I took 100 grs. of black tea and collected 
all the carbonic acid exhaled under its influence, and weighed all that collected in the 
first hour, and then each quarter of an hour for three times, and finally in five minutes, 
when the basis was reached and the inquiry ended. The average increase in the carbonic 
acid was '64 gr. and the maximum l'23gr. per nrinute, and thus the total increase in 
110 minutes was 70 '40 grs. The quantity of air was increased on the average 4( 5 cubic 
iirches, and the maximum increase was 77 cubic inches per minute at the end of the fii’st 
hour. The pulse fell and the rate of respiration slightly increased, whilst the depth of 
insphation increased nearly 5 cubic inches. 
Tea.Milk^ and 6 (6 exps.), Plate XXXVI. fig. 30. 50 grs. of black tea. 
taken with milk and sugar, gave us maxima of increase in the carbonic acid of 2 '96 grs. 
and 2 '56 grs. per minute. The maximum increase in the quantity of air was 78 cubic 
inches per minute. There was also increased rate both of respiration and pulsation. 
Tea and Citric Acid . — July 9 (7 exps.), fig. 36, July 13 (5 exps.), July 15 (5 exps.), 
July 13 p.M. (3 exps.), July 12 (5 exps.). 100 grs. of black tea, taken with 30 grs. of 
citric acid, gave me maxima of increase of carbonic acid in three experiments of 1'86 gr.. 
I'll gr., and 1'14 gr. per minute; on another occasion it was only '88 gr. per minute 
in Mr. Moul. The increase in the quantity of air inspired -was 72 cubic inches, 60 '5 
cubic inches, and 72 cubic inches per minute in myself, and 6 cubic inches per minute 
in Mr. Moul ; but in him there was also a maximum decrease of 18 cubic inches per 
minute. The rate of respiration and pulsation was always considerably increased in 
myself, but not in Mr. Moul. 
When taken in the afternoon I had no increase of the carbonic acid, and the effects 
much more resembled those observed in Mr. Moul in his experiment before breakfast. 
Tea, with Soda and Potash.— Jvlj 10 (6 exps.), fig. 37. 100 grs. of black tea, with 
50 grs. each of carbonate of soda and potash, with 8 oz. of water, gave me a maximum 
increase in carbonic acid of 1'08 gr. per minute, and in air 39 cubic inches per minute. 
The rate of respiration scarcely varied, but that of pulsation was a little increased. 
Tea, with Caustic Alkali . — July 22 (5 exps.), fig. 38. 100 grs. of black tea, with 40 it 
of Liq. Potassse and 7 oz. of wnter, gave no increase in the carbonic acid. There was an 
increase of 27 cubic inches of air. The rate of respiration was unchanged, but that ot 
pulsation fell. 
