CONTENTS. vii 
CHAPTER XI. 
PAGE 
egret WY ae ig ais ws ace a wee Ws 2 pas caews sida we 336 
§ 1. The Expenditure of Energy by the Body.............200e005 336 
§2. The Fasting Metabolism............. 0.0... cc eee ccecceces 340 
Nature of Demands for Energy...............seceeeeees 340 
Heat Production. ............0cccccccceccececcvecrecs 344 
Influence of Thermal Environment ...............- 347 
Influence of Size of Animal ...............cceeeees 359 
§ 3. The Expenditure of Energy in Digestion and Assimilation..... 372 
CHAPTER XII. 
Net AvamaBLe ENERGY—MAINTENANCE......cccceeccccecccccececs 394 
§1. Replacement Values................ccccececeeeeeereeees .. 896 
§2. Modified Conception of Replacement Values..............+60 405 
§3. Net Availability... 2.0... ccc cece cece ene e ene eeeees 412 
Determinations of Net Availability ..............0..00. 413 
Discussion of Results........... 000 ccc cece reeee een 430 
Influence of Amount of Food .............cceeeuees 430 
Character of Food..........0.0ccceeeeeceeeceeneee 431 
The Maintenance Ration...........cccceccceeeeees 432 
CHAPTER XIII. 
THE UTILIZATION OF ENERGY.......0c cece ce cece ac ceeeeceneeseesees 444 
$1. Utilization for Tissue Building.......... eee e eee ee en enetoees 448 
Experimental Results. ..............0 0 ce eeee nsec rece 448 
Discussion of Results...........00cceecceceecseceeees 465 
Influence of Amount of Food..........eceeeeeeeees 466 
Influence of Thermal Environment..............60. 471 
Influence of Character of Food............0.0eeea0e 472 
The Expenditure of Energy in Digestion, Assimilation 
and Tissue Building...............0eeeceee eee ee 491 
§2. Utilization for Muscular Work......... 06. c cece cece eee eee 494 
Utilization of Net Available Energy........... sistalavere ars 497 
The Efficiency of the Animal as a Motor............ 498 
Conditions determining Efficiency.................. 511 
Utilization of Metaholizable Energy............----22.4 525 
Wolff's Investigations........c0 esc ee eee cece eene 528 
