While in this research our experience in securing a general basal value for use is by no means satisfactory, it has occasionally been necessary to use an average base-line. Inasmuch as a large number of values were secured, it is probable that any variations in the individual values will be more or less eliminated in the grand average. Nevertheless it is quite clear that a general base-line, even for a well-trained subject who is experimented upon each day, can not properly be used for studying the minor factors influencing basal metabolism, such as may be found in connection with the ingestion of certain of the food materials studied.

Table: 48. - Oxygen Consumed At Different Times Of Day In Respiration Experiments; Subject M. A. M., In Post-Absorptive Condition And Lying On Couch

(Values per minute).

Average age, 29 years. Average body-weight (naked), 66.0 kilograms. Height, 177 cm.

Date.

Duration of experiments.

First half hour.1

Second half hour.1

Third half hour.1

Fourth half hour.1

Fifth half hour.1

Sixth half hour.1

Average.

1911.

c.c.

c.c.

c.c.

c.c.

c.c.

c.c.

c.c.

Dec. 7

9h04ma.m. to 10h41ma.m.. .

. • ■

251

262

277

257

...

262

8

9 21 a.m. to 10 04 a.m..

246

247

...

247

11

10 11 a.m. to 11 16 a.m.. .

232

243

238

238

12

9 22 a.m. to 10 02 a.m...

233

226

. .

• ...

230

13

8 33 a.m. to 9 37 a.m.. .

226

222

231

. ..

...

226

14

8 50 a.m. to 9 52 a. m.. .

241

237

235

. .

...

238

15

8 29 a.m. to 9 31 a.m.. .

254

252

245

. ,

...

250

19

8 32 a.m. to 9 34 a.m.

235

250

229

. .

...

238

20

8 25 a.m. to 9 19 a.m.. .

226

227

225

. .

...

226

21

8 22 a.m. to 9 15a.m...

230

231

231

, .

...

231

22

8 27 a.m. to 9 22 a.m.. .

229

217

229

225

1The experimental periods were usually 15 minutes in length and there was but one period in each half hour.

Date.

Duration of experiments.

First half hour.1

Second half hour.1

Third half hour.1

Fourth half hour.1

Fifth half hour.1

Sixth half hour.1

Average.

1912.

c.c.

c.c.

c.c.

c.c.

c.c.

c.c.

c.c.

Jan. 1

8 33 a.m. to 9 35 a.m...

232

233

233

• • •

233

2

8 49 a.m. to 9 26 a.m.. .

231

232

• • •

232

3

8 26 a.m. to 9 24 a.m.. .

233

237

229

* • •

233

4

8 26 a.m. to 8 41 a.m.. .

235

...

* • *

235

6

8 29 a.m. to 8 44 a.m.. .

233

. ...

233

8

8 34 a.m. to 9 10 a.m.. .

228

234

• • •

231

0

8 30 a.m. to 9 10 a.m.. .

237

246

. * •

242

10

8 29 a.m. to 9 07 a.m.. .

258

259

...

.. •

259

12

8 34 a.m. to 9 10 a.m.. .

266

259

263

15

8 33 a.m. to 9 11 a.m.. .

266

249

* * ■

258

16

8 36 a.m. to 9 14 a. m.. .

250

245

....

248

17

8 30 a.m. to 9 10 a.m.. .

253

249

.....

251

18

8 30 a.m. to 9 09 a.m.. .

255

267

....

261

19

8 29 a.m. to 9 43 a.m.. .

252

269

259

....

260

23

8 42 a.m. to 9 47 a.m.. .

252

240

247

...

246

24

8 34 a.m. to 9 13 a.m.. .

230

234

...

....

232

25

8 36 a.m. to 9 40 a.m.. .

260

236

251

. . .

249

26

8 32 a.m. to 9 11 a.m.. .

240

233

237

31

8 35 a.m. to 9 44 a.m.. .

235

241

244

240

Feb. 1

8 46 a.m. to 9 26 a.m.. .

239

242

... .

241

2

8 40 a.m. to 9 43 a. m.. .

243

247

247

. . •

246

6

8 47 a.m. to 11 50 a.m.. .

243

233

225

234

2231

2233

7

8 35 a.m. to 9 36 a.m.. .

236

232

231

...

233

8

8 36 a.m. to 9 31 a.m.. .

260

254

254

. . ■

256

9

8 38 a.m. to 9 39 a.m.. .

244

237

246

242

13

8 38 a.m. to 9 43 a.m...

234

235

230

. ■ •

233

14

8 36 a.m. to 9 39 a.m...

239

232

233

...

235

15

8 38 a.m. to 9 36 a. m.. .

234

228

240

234

16

8 40 a.m. to 9 40 a. m.. .

220

223

222

...

222

20

8 46 a.m. to 9 49 a.m.. .

243

250

250

...

248

21

8 39 a.m. to 9 44 a.m...

243

232

233

236

23

8 42 a.m. to 9 43 a.m.. .

229

234

243

. • ■

235

26

8 41 a.m. to 9 45 a.m.. .

229

245

243

• > •

239

27

8 40 a.m. to 9 42 a.m.. .

242

241

235

• • •

239

29

8 41 a.m. to 9 41 a.m.. .

253

257

265

..

258

Mar. 6

8 47 a.m. to 10 01 a.m.. .

261

257

258

259

11

8 44 a.m. to 9 22 a.m.. .

...

245

248

...

247

20

12 45 p.m. to 2 02 p.m.. .

3240

22

8 22 a.m. to 10 35 a.m.. .

255

245

254

249

248

...

250

26

8 43 a.m. to 9 42 a.m.. .

232

235

232

...

233

29

8 43 a.m. to 9 50 a.m.. .

277

283

269

282

...

278

Apr. 16

8 38 a.m. to 9 34 a.m.. .

249

238

250

246

1914.

Apr. 18

8 24 a.m. to 10 03 a.m. . .

226

229

229

232

229

Days....................

43

48

40

10

4

2

«54

Minimum.............

220

217

222

225

234

231

222

Maximum..............

277

283

269

282

257

238

278

Average.................

242

242

241

246

246

235

242

M. V...................

11.0

10.1

9.9

16.3

7.0

3.5

9.7

1The experimental periods were usually 15 minutes in length and there was but one period in each half hour. 2Two other results (seventh period, 231 c.c, and eighth period, 231 c.c.) were obtained and included in the average for the day. 3Average of results obtained in ninth to twelfth periods, 246, 235, 236, and 241 c.c., respectively. 4The total number of periods in which the oxygen was determined in the 54 experiments was 153.