DAVIS.

Date.		Body-weight.	Urine.
Date.		Body-weight.	Volume. 24 hours.	Sp. Gr.	Nitrogen.		Uric Acid.		P₂O₅.
1903		kilos	c.c.		grams		gram		grams
Oct.	4	59.3	2030	1014		15.15		0.672		1.99
	5	59.3	1160	1020		10.99
	6	59.0	850	1024		9.38		0.503		1.26
	7	59.1	1860	1012		13.95
	8	59.3	960	1021		9.33		0.398		1.47
	9	58.3	900	1027		11.56
	10	58.3	1660	1017		17.23
	11	58.7	1460	1019		16.02		0.724		2.27
	12	58.5	1060	1022		11.82
	13	59.4	1920	1014		16.59		0.689		2.53
	14	59.4	1460	1022		13.14
	15	58.9	1320	1021		13.38		0.493		1.53
	16	58.9	1900	1015		17.10
	17	59.0	1410	1019		14.55
	18	59.5	1650	1017		15.25		0.647		1.92
	19	59.1	1120	1022		13.37
	20	58.2	1150	1020	⎫	11.56 daily average		0.480 daily average		1.50 daily average
	21	58.2	980	1021	⎪
	22	59.1	1320	1022	⎬
	23	59.4	1320	1016	⎪
	24	58.6	1160	1022	⎪
	25	59.2	1300	1013	⎭
	26	59.0	860	1024	⎫	9.20		0.474		1.35
	27	59.2	1240	1024	⎪
	28	59.4	1440	1014	⎪
	29	59.5	820	1022	⎬
	30	59.4	1000	1017	⎪
	31	59.2	920		⎪
Nov.	1	59.4	1120	1015	⎭
	2	58.7	840	1026	⎫	9.07		0.474		1.48
	3	59.1	1290	1018	⎪
	4	59.0	680	1025	⎪
	5	58.5	305	1027	⎬
	6	58.4	700	1023	⎪
	7	58.7	780	1022	⎪
	8	58.5	1720	1011	⎭
	9	58.2	1320	1015	⎫	8.33		0.422		1.38
	10	58.9	920	1020	⎪
	11	59.3	1640	1014	⎪
	12	58.9	780	1024	⎬
	13	59.0	940	1025	⎪
	14	59.0	1180	1016	⎪
	15	59.0	1900	1013	⎭
	16	58.8	1080	1022	⎫	9.60		0.398		1.50
	17	59.0	1080	1018	⎪
	18	58.4	1500	1017	⎪
	19	58.2	1260	1018	⎬
	20	58.1	1220	1025	⎪
	21	58.7	1120	1022	⎪
	22	58.7	1100	1021	⎭
	23	58.6	1140	1017	⎫	9.00		0.447		1.52
	24	58.4	1360	1017	⎪
	25	58.3	1700	1010	⎪
	26	58.2	1120	1023	⎬
	27	59.4	1620	1017	⎪
	28	58.0	700	1027	⎪
	29	58.7	1660	1025	⎭
	30	58.5	800	1025	⎫	11.41		0.417		2.12
Dec.	1	58.0	700	1020	⎪
	2	57.4	680	1028	⎪
	3	57.0	640	1028	⎬
	4	57.0	940	1032	⎪
	5	56.2	660	1032	⎪
	6	56.0	800	1029	⎭
	7	56.0	800	1026	⎫	8.91		0.412		1.43
	8	56.1	780	1030	⎪
	9	57.0	820	1022	⎪
	10	58.0	500	1025	⎬
	11	57.1	580	1029	⎪
	12	57.3	820	1031	⎪
	13	57.8	580	1027	⎭
	14	57.5	740	1027	⎫	7.96		0.413		1.50
	15	57.5	1680	1015	⎪
	16	57.9	900	1021	⎪
	17	57.4	780	1013	⎬
	18	56.9	800	1026	⎪
	19	57.4	730	1025	⎪
	20	57.4	800	1023	⎭
	21	57.4	1310	1017	⎫	7.35		0.319
	22	57.0	1370	1014	⎪
	23	57.0	980	1020	⎪
	24	57.0	865	1016	⎬
	25	57.4	1300	1017	⎪
	26	58.0	1390	1017	⎪
	27	57.3	1340	1018	⎭
	28	57.6	875	1019	⎫	6.83		0.413		0.99
	29	57.0	680	1020	⎪
	30	56.8	685	1029	⎪
	31	56.7	815	1026	⎬
1904					⎪
Jan.	1	57.4	1150	1015	⎪
	2	57.9	1610	1023	⎪
	3	58.6	1120	1023	⎭
	4	58.3	1350	1011	⎫	7.04		0.372		0.95
	5	57.8	1255	1017	⎪
	6	58.0	925	1022	⎪
	7	58.6	1120	1016	⎬
	8	58.4	1350	1020	⎪
	9	57.7	890	1026	⎪
	10	58.6	1510	1012	⎭
	11	57.9
	12	57.2	835	1017		8.32		0.408
Daily average from Oct. 26			1045	1021		8.61		0.414		1.42

Any elaborate discussion of the individual results, tabulated in the foregoing tables, seems hardly necessary. To any one interested in the details of the work, a study of the tables themselves will give the necessary information. It may be well, however, to emphasize at once a few of the fundamental points most striking in character which bear upon the main problem. Take, for instance, the case of Oakman, where the data are recorded for every day from October 4, 1903, to April 4, 1904. The degree of proteid metabolism, as indicated by the excretion of nitrogen through the kidneys, is here shown for each day of the six months. Up to November 3, practically for a month, there was not observable any very noticeable change in the rate of proteid metabolism, but commencing with November 4, the nitrogen excretion dropped very rapidly, and as one glances through the daily records for month after month, it is seen that the daily nitrogen output through the kidneys fell to 6 to 8 grams per day, with a daily average excretion of 7.42 grams of nitrogen, as figured from October 21 to April 4.

Further, it will be noted that while the body-weight gradually declined during the first three months, falling from 66.7 kilos down to 62.3 kilos on January 18, from that date on to the close of the experiment the body-weight was practically constant. Here, then, we see, under the use of a prescribed diet quite sufficient in amount to satisfy the cravings of the appetite, a lowering of proteid metabolism equal to that obtained by the individuals of the preceding group. Again, if the body-weight of Oakman is placed at 64 kilos, as representing the average between the initial body-weight and the weight during the last three months, it will be found that the output of metabolized nitrogen per kilo of body-weight amounted to 0.116 gram; not widely different from similar data obtained with men of the preceding group.

FRITZ

Photograph taken at the close of the experiment.

Moreover, these results obtained with Oakman are practically duplicated by every other member of this group of soldiers detailed from the United States Army. No exception whatever is to be seen, but every man shows the same lowered proteid metabolism, with practical maintenance of body-weight, with complete satisfying of the appetite, and without loss of health, strength, or vigor, as will be enlarged upon later.

While in the case of Oakman, the nitrogen excreted was determined by an analysis made each day, in the case of the other men of this group the data are given mainly for weekly periods; the results being expressed, however, in the average daily amount for each seven days’ period. By comparing the figures for the daily excretion of nitrogen with the daily dietary, it is easy to trace out the influence of the changes in diet on the extent of nitrogen metabolism.

In considering the changes in the rate of proteid metabolism shown by all the members of this group, it will suffice for present purposes to deal mainly with the average results.

Compare now the average daily output of nitrogen through the urine from November 1 until April 4—a period of five months—of each of these men.