742 DE. E. SMITH ON THE ACTION 
action of sugar, tea, and coffee, in my experiments, affords indisputable e^den^ of then 
truthfulness. He classes sugar, coffee, and alcohol together ; and although the class o 
alcohols is a difficult one for investigation, and consists of substances which are known 
to vary in their action, the truthfulness of my results in reference to two of the thi-ee, m 
opposition to those obtained by M. Boexee, is presumptive of the truthfulness of the 
third. 
Explanation of the Plates. 
PLATE XXXV. 
Kepresents the effect of numerous articles of food when taken m moderate doses alone, 
fasting, and under precisely the same circumstances, upon the carbonic acid 
expired, the air inspired, the depth of insphation, and the rate of pulsation 
and respiration. They are arranged in four series; viz. Eats, figs. 1 and 2 ; 
the Starch Series, figs. 3 to 13 ; the Milk Series, figs. 14 to 21 ; and the Siigai- 
Series, figs. 22 to 29. 
PLATE XXXVI. 
Kepresents similar inquiries in reference to articles arranged in the Tea Senes, figs. oO 
to 43, and in the Alcohol Series, figs. 44 to 56 ; and also the effect of Albumen. 
In the construction of these two Plates the absolute qiiantities have not been delineated, 
but only the increase or decrease from the quantities ascertained immediately before the 
food was taken. These latter quantities are regarded as basal quantities,^ and they are 
stated in figures near the basal line of each object of inquiry m each experiment. Thus 
in fig. 47, “ S. 8-33” and “ M. 7-98” placed under the basal line of the carbonic^acid, show 
that before the tea was taken Dr. Smith expired 8-33 grains, and ISH.Moul 7-98 grams 
of carbonic acid per minute ; and the direction of the curves shows how fai- the quantity 
at each inquiry exceeded the basal quantity. The period at which each inquhy was 
commenced after the food had been taken is stated in hours and minutes at the head 
of each column. Each inquiry was continued during five minutes after the period 
just mentioned ; but in some experiments it was continuous for one hom, and followed 
by others at intervals, as in fig. 33, or was continued without intermission until the end, 
but the quantities recorded every five minutes, as in fig. 34. In figs. 24, 25, 35, 45, 
and 50, the dose of the food was repeated more or less frequently during the experiment, 
and then the figures at the head of each column show the period when the inquuy was 
made after the repetition of each dose. 
The temperature and the height of the barometer are recorded at the head of each 
figure. 
