Subject No. 3.  April 24, 1906

Subject No. 3.  June 27, 1906

Passing now to the third subject, we have an experiment of somewhat shorter duration, viz., of nine months, but sufficiently long to afford ample opportunity for any deleterious effect to manifest itself. The initial weight of the dog, No. 13, was 14.5 kilograms on September 14. The lowest intake of nitrogen was 0.26 gram per kilo of body-weight per day, while the fuel value of the daily food was during one period reduced to 55 calories per kilo. A daily proteid consumption equalling 0.30 gram of nitrogen per kilo, with a total fuel value in the day’s food of 66–70 calories per kilo, was clearly quite sufficient to maintain nitrogen equilibrium and body-weight; indeed, toward the end of the experiment, the animal commenced to gain in weight quite noticeably on the above diet, and was laying by fairly large amounts of nitrogen daily. The accompanying table gives the average daily nitrogen exchange, etc., of the nine balance periods, while the photographs, taken on the dates indicated under each, show the appearance of the animal at various times.

SUBJECT No. 13. DAILY AVERAGES

Date.Body-
weight.		Food.Output.Nitro-
gen
Balance
+ or –

Total
Nitro-
gen.

Nitro-
gen per
Kilo
Body-
weight.

Fuel
Value
per Kilo
Body-
weight.

Nitro-
gen
through
Kid-
neys.

Nitro-
gen
through
Excre-
ment.

Nitro-
gen
through
Hair.

1905

kilos

grams

gram

calories

grams

gram

gram

gram

Sept. 24-Oct. 3

14.0

7.22

0.52

86.0

6.40

0.71

0.19

–0.08

Nov. 5-Nov. 14

13.0

4.78

0.35

80.0

4.29

0.37

0.25

–0.13

Dec. 19-Dec. 28

13.4

3.70

0.27

72.0

2.86

0.49

0.13

+0.22

1906

Jan. 16-Jan. 25

14.1

3.72

0.26

70.0

3.16

0.61

0.16

–0.21

Feb. 13-Feb. 22

14.3

4.26

0.30

78.0

3.54

0.67

0.37

–0.32

Mar. 13-Mar. 22

14.1

3.62

0.26

55.0

3.29

0.46

0.14

–0.27

Apr. 10-Apr. 19

14.2

4.59

0.32

73.0

2.84

0.51

0.10

+1.14

May 8-May 17

14.2

4.59

0.32

71.0

3.56

0.48

0.18

+0.37

June 5-June 14

15.3

4.58

0.30

66.0

2.98

0.55

0.28

+0.77

Subject No. 13.  January 2, 1906

Subject No. 13.  February 27, 1906