To give a general idea of the research and the sequence of events, a chronological history, for both Squads A and B, is included here for the period from September 22, 1917, to May 22, 1918, inclusive.

September 22

Shipment of apparatus and general supplies from Boston to Springfield.

1Transition pulse-rate, standing to walking, and walking to standing, visual counts of the galvanometer, and blood-pressure measurements immediately at the end of walking not taken with Squad B on January 6.

September 24 General Call For Volunteers

September 25. Unpacking and installation of apparatus. September 27, Squad A. First experiments in Springfield with respiratory-valve apparatus and portable respiration apparatus and first records of pulse-rate; first collection of urine. September 29, Squad A. Came to Boston (Kon excepted). Came to Laboratory immediately after prescribed evening meal and took psychological tests for first time in following order: Group tests in library: Accuracy in tracing between irregular parallel lines. Memory span for 4-letter English words. Addition of one-place numbers for a period of 10 minutes. Discrimination for specified number groups on a printed page. Discrimination for the pitch of tone. Individual tests in psychological laboratory and adjoining rooms: Sensory threshold for electric shock.

Latency, Amplitude, And Refractory Period Of The Patellar Reflex

Speed of the finger movements. Efficiency in traversing a right-angle maze. Efficiency in performing certain clerical tasks. In addition to psychological measurements, other measurements were: First Du Bois surface measurements; first profile photographs; first experiment in group respiration chamber. September 80, Squad A. In Boston at Laboratory part of morning. First record of body-weight. October 1 to 8, inclusive, Squad A. Normal diet at training table; food portions weighed, sampled, and samples analyzed. First digestion period for collection of feces. (Pec not included; he was always irregular in these periods.) October 2, Squad A. Physical examination, Dr. Chapin (Can, Gul, and Kon excepted). October 4, Squad A. First reduction in diet. October 6, Squad A. Pedometers used from this date to end of experiment.

First Use Of Bran In Diet. October 6, Squad B

Came to Boston. At Laboratory immediately after prescribed evening meal and took psychological experiments as outlined for Squad A on September 29. Kon and Mac included in these measurements, but McM, Kim, and Sch not included. First experiment in group respiration chamber. October 7, Squad B. First record of body-weight (McM, Kim, and Sch excepted). October 8-11, inclusive, Squad A. Second digestion period for collection of feces. October 9, Squad A. Affidavit signed. October 10, Squad A. Began using margarine instead of butter for some of the meals. October 13, Squad A. Came to Boston; supper at restaurant. At Laboratory after evening meal; second series psychological tests. Added to tests: Sensory threshold for visual efficiency (acuity). Reaction time for speaking 4-letter words.

Continuous Discrimination And Reaction In Finding Serial Numbers

First clinical examination, Dr. Goodall; second experiment in group respiration chamber. October 14, Squad A. In Boston; at Laboratory part of mormng. Meals uncontrolled on this date, except for breakfast at Laboratory.

October 16, Squad A

Topped milk, i. e., part of cream removed, used on this date and subsequently; whole milk used previous to this date.

October 17-20, Inclusive, Squad A

Third digestion period for collection of feces.

October 19, Squad A

First bicycle ergometer experiments made by Professor Johnson; made on Mondays and Fridays throughout research with Squad A.

October 24, Squad A

Last day Fre ate at training table.

October 24, Squad B

First bicycle ergometer experiments with Professor Johnson; made on Wednesdays with Squad B throughout research.

October 27, Squad A

Came to Boston; supper at restaurant. Psychological tests previously described, also strength of grip. Kon served in place of Fre. Second clinical examination, Dr. Goodall (first for Kon)) second profile photographs (first for Kon); first Du Bois body-surface measurements for Kon. Third experiment in group respiration chamber (11 men only, i. e., without Kon).

October 28, Squad A

In Boston; at Laboratory part of morning. Meals uncontrolled on this date, except for breakfast at Laboratory. First Sunday morning program for psychological measurements; individual measurements as follows: Changes in pulse-rate occasioned by short periods of exertion. Reaction time for turning the eye to a new point of regard. Speed of the eye movement.

Two finger movement records, like those taken in evening. Strength of grip.

October So, Squad A

Kon at training table for first time.

Oct. 3i To Nov. 3, Inclusive, Squad A

Fourth digestion period for collection of feces.

November 3, Squad A

First use of currant jelly to replace more or less butter in diet.

November 3, Squad B

Came to Boston. Evening psychological tests. McM served as subject in place of Kon, transferred to Squad A. Second experiment in group respiration chamber.

November 4, Squad B

In Boston; at Laboratory part of morning. First Sunday morning program of psychological measurements. (See Oct. 28 for outline).

November 10, Squad A

Came to Boston; dinner and supper at restaurant (Pea had dinner in Springfield). Regular evening psychological tests. Third clinical examination, Dr. Goodall. Individual 5-minute practice walking on treadmill in preparation for subsequent walking experiments. Questioned in evening regarding introspection on diet, hunger pains, physical endurance, etc. Fourth experiment in group respiration chamber.

November 11, Squad A