the experiments on tea, and quote from the interesting narrative of Dr.
Chambers.

"After Dr. Böcker had determined by some preliminary trials what
quantity of food and drink was just enough to satiate his appetite
without causing loss of weight to his body,--that is to say, was
sufficient to cover exactly the necessary outgoings of the
organism,--he proceeded to special experiments, in which, during
periods of twenty-four hours, he took the amount of victuals
ascertained by the former trials.

"The first set of the first series of experiments consists of seven
observations, of twenty-four hours' duration each, in the months of
July and August, with three barely sufficient meals _per diem_, in
quantities as nearly equal each day as could be managed, and only
spring-water to drink. The second set comprises the same number of
observations in August, September, and October, under similar
circumstances, except that infusion of tea, drunk cold, was taken
instead of plain water.

"Each day there are carefully recorded" qualitative and quantitative
analyses of the excretions,--estimates of "the amount of insensible
perspiration, and of expired carbonic acid,--the quickness of
respiration,--the beats of the pulse,--together with accurate notes of
the duration of bodily exercise in the open air, the loss of weight of
the whole body, the general feelings, and the circumstances,
thermometric, barometric, and meteoric, under which the observations
are taken.

"A second series of seventeen experiments of equal duration were made,