viii CONTENTS 



CHAPTER VI. 



SECTION 



PAGE 



PROTEIN REQUIREMENTS . 66 



SECTION 



1. The Protein Minimum - ... 55 



2. The Work of Chittenden - . 69 



3. Quantity or Quality of Protein ? - 7 1 



4. Feeding Experiments with " Abnormal " Proteins - - 72 



5. The Influence of a "Pure" Diet - 74 



6. The Psychic Influence - 76 



7. The Rise in the Output of Nitrogen after a Meal - 77 



8. The Effect of the Partition of the Diet on the Output of the 



Nitrogen - .78 



9. Storage of Protein - - 79 



10. In what Form is Protein Retained? - 83 



11. What is the Cause of the Retention ? - 85 



12. Examination of the Nitrogen : Sulphur Ratio - - 87 



13. Examination of the Nitrogen : Phosphorus Ratio - 89 



CHAPTER VII. 



THEORIES OF PROTEIN METABOLISM - 90 



SECTION 



1. Voit - 90 



2. Pfliiger - - - 91 



3. Rubner - 92 



4. Speck - - 93 



5. Folin - 94 



CHAPTER VIII. 



STARVATION - - - 96 



1 . Output of Total Nitrogen - - 96 



2. The Output of Urea and Ammonia - -97 



3. The Output of Creatine and Creatinine - - 98 



4. The Output of Purines - - 102 



5. The Output of Sulphur - - 103 



6. The Influence of Non-nitrogenous Substances on the Rate of 



the Protein Breakdown - - 104 



7. The Capacity of the Starving Organism to deal with Injected 



Amino Acids - - 105 



8. Autolysis - 106 



CHAPTER IX. 



WORK - - 109 



SECTION 



1. The Influence of Work on the Output of Nitrogen - - 109 



2. Differences between Voluntary and Involuntary Muscle Con- 



traction - 112 



3. The Influence of Work on General Metabolism - - 113 



4. Why does Work have so little Apparent Influence on the Cata- 



bolism of Protein ? - 113 



5. The Part Played by Carbohydrates - - 116 



6. Intra- cellular Synthesis (a) In vitro Experiments - 118 



7. (b} In vivo Experiments - 119 



8. Carbohydrates and Fats as Protein Sparers - 120 

 BIBLIOGRAPHY - - 123 

 INDEX . 141 



