CONTENTS. vii 
CHAPTER XI. 
PAGE 
INTERNAL: WORKS. ic. Saiacd aw tee designe sed hog Meee dee ea vawewenees 336 
§1. The Expenditure of Energy by the Body Rie Ted teasvial sae tusaroneaaaass 3a 336 
§2. The Fasting Metabolism............. 00.0... c cece cece cece 340 
Nature of Demands for Energy................c00e ee eee 340 
Heat Productions ac -sé Mates gate cn seed sa ea aneue aie een 344 
Influence of Thermal Environment ...............- 347 
Influence of Size of Animal................000000. 359 
§3. The Expenditure of Energy in Digestion and Assimilation..... 372 
CHAPTER XII. 
Net AVAILABLE ENERGY—MAINTENANCE........ccccccccccceceeeece 394 
$1. Replacement. Values, sic. ones ade es ay veeisees ewe scene waa ne 396 
§ 2. Modified Conception of Replacement Values.............0000 405 
§3. Net Availability... 2.0.0... 0.0 ce cece cee eee ence eeneas 412 
Determinations of Net Availability ................005 413 
Discussion of Results. .......... ccc eee e cence cece eens 430 
Influence of Amount of Food ..............0c0eeeee 430 
Character of Food.......... cee cece cece ee eeeeeeees 431 
The Maintenance Ration.............0cseeeceeeees 432 
CHAPTER XIII. 
THE UTILIZATION OF ENERGY....... 0. cece cece eee eee e eee ceee neces 444 
§ 1. Utilization for Tissue Building. ...... 0.0... ... cece cee eens 448 
Experimental Results............ ce eee ee eee cece eens 448 
Discussion of Results... .... 0... cece cece ee eee cece eeees 465 
Influence of Amount of Food...............eee0ee- 466 
Influence of Thermal Environment................. 471 
Influence of Character of Food...............eeeaee 472 
The Expenditure of Energy in Digestion, Assimilation 
and Tissue Building.............. cece eee eee 491 
§2. Utilization for Muscular Work. ......... 00. ese e cece eee ees 494 
Utilization of Net Available Energy...............eeeee 497 
The Efficiency of the Animal as a Motor............ 498 
Conditions determining Efficiency...............66- 511 
Utilization of Metabolizable Energy...............0006- 525 
Wolff’s Investigations. ... 0... 0... cece eect eee eee 528 
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