124 
unfolding the bed. chair, and table, eating, caring for the excretory 
products, and weighing themselves and the absorbers. They did 
more or less reading and writing to pass the time. In the work 
experiments they spent a number of hours, generally 8 each day. 
driving a stationary bicycle.* It was their purpose to do a reasonable 
but not excessive amount of work. 
Experiments Nos. 1 and 2 with E. O., No. 3 with O. F. T., and Nos. 
4a and 4b with A. W. S., were rest experiments, while No. 4c with 
A. W. S. was a work experiment. In none of these experiments were 
satisfactory determinations made of the outgo of energy. The experi- 
mental days began at different hours, and were not divided into 
6-hour experimental periods, as was done in all experiments after 
No. 4c. Taking into account the 19 experiments, summarized in the 
following tables, in which the measurements of the outgo of energy 
were considered satisfactory, there were 9 rest experiments with 
E. O., covering 33 days; 1 rest experiment with A. W. S., covering 3 
days, and 3 rest experiments with J. F. S., covering 9 days, making 
altogether 13 rest experiments, covering 45 days. There were also 2 
work experiments with E. O., covering 8 days, and 4 work experi- 
ments with J. F. S., covering 12 days, making together 6 work 
experiments, covering 20 days. Altogether the 19 rest and work 
experiments covered a total period of 65 days. In addition, 9 rest 
experiments covering 22 days and 2 work experiments covering 6 
days were completed during this time in connection with a separate 
investigation. 
Division of experimental days into periods. — Each of these experi- 
ments is divided into da} T s of 24 hours, beginning and ending at 7 a. m. 
Each day is divided into 4 periods of 6 hours each; the first 2, called 
day periods, extending from 7 a. m. to 1 p. m. and from 1 p. m to 7 
p. m. ; the last 2, called night periods, extending from 7 p. m. to 1 a. 
m. and from 1 a. m. to 7 a. m. 
The chief reason for beginning the experimental day in the morning 
is found in the belief that the condition of the bod^v in respect to the 
amounts of material in the alimentaiw canal and of carbohydrates (glyco- 
gen) andoxvgen in "the tissues and fluids would be more nearly the same, 
from day to day, at the end of the period of rest and sleep than at any 
other time. 
!l Excepting in experiment ISo. 4b, in which the subject raised and lowered a 
weight attached to a rope which passed over a pulley. 
