84 
Su(/a7- as a Food for Stock. 
(1) A fixed amount of bran and lentils, with sugar ad libitum. 
(2) Ditto ditto with starch ad libitum. 
(3) Ditto ditto with equal parts of 
both sugar and starch ad libitum. 
(4) Lentils, bran, sugar, and starch, all ad libitum. 
I do not know how an experiment could be arranged which 
would be better adapted to ascertain the relative value of starch 
and sugar. In the following table will be found the summary 
of the results, as well as the remarks upon them. 
Food Consumed. 
Pen 1. 
Pen 2. 
Pen 3. 
Pen 4. 
lbs. 
lbs. 
lbs. 
lbs. 
672 
672 
672 
918 
126 
126 
126 
47 
388J 
28GJ 
446 
450^ 
292J 
51 
Total 
1186J 
1248^ 
1377 
1462 
Increase of live-weight 
247 
248 
272 
312 
1056i 
1055 
1196 
1300 
1017i 
1017J 
1156^ 
1254 
It is a sufficiently remarkable fact in relation to the main 
object of this investigation — that is to say, the question of the 
equivalence of starch and sugar in food — that with three pigs 
in each case, the experiment extending over ten weeks, and the 
ad libitum starch or sugar, constituting one third of the total 
food, there should be in Pens 1 and 2 — in the former with sugar 
and in the latter with starch — absolutely identical amounts of d7y 
organic substance consumed in both cases ; and also, within one 
pound, the same amount of gross increase in weight yielded 
by it. 
It thus appears that, whether for the purpose of supporting 
the functional actions of the body, or of ministering to the forma- 
tion of increase — for, as will be seen, the rate of increase was in 
both cases good — these two substances, starch and sugar, have, 
weight for weight, values almost identical. 
It is hardly necessary for me to make any further quotation 
from these experiments. I would, however, point out that in 
Pen 4, where the pigs could select from the four foods what they 
liked the best, they took very little starch or bran, and almost 
confined themselves to lentils and sugar. This diet, though it 
pleased their palates, could produce but little more increase upon 
