viii CONTENTS 



CHAPTER IX. 



THE NUCLEIC ACIDS AND THE NITROGENOUS BASES. 



The Decomposition-products of the Nucleic Acids . . ..... . 173 



The Structure of the Nucleic Acids - 178 



Amines derived from Amino-acids . ... '. -<'.' . . . . 184 



The Betaines and the Vitamines . . 189 



Nitrogenous Bases derived from Guanidine . . . ...... . * . 194 



Nitrogenous Bases derived from the Phospholipins 196 



Nitrogenous Bases forming the Active Principles of Internal Secretions . 197 



CHAPTER X. 



THE HYDROLYZING ENZYMES. 



General Characteristics of the Enzymes 201 



The Quantitative Relationships in Hydrolysis by Enzymes . . : : . . 207 



The Influence of Temperature upon Enzymes . .... . . . . 213 



The Influence of Reaction upon Hydrolyses by Enzymes . . ;.. . . . 217 



The Specificity of the Hydroly zing Enzymes . . . .. . . . . . 218 



The Synthetic Action of Hydroly zing Enzymes . . .221 



Antienzymes . . -, . . . . . . . . . ..-.'.-'". . . . 226 



CHAPTER XI. 



THE DIGESTION AND ASSIMILATION OF THE FOODSTUFFS. 



The Digestion of the Carbohydrates ... . . . . . ^ . . . . 228 



The Digestion of the Fats . ...... : ., 1 .. ... . 232 



The Digestion of the Proteins . . . .... .... . ... . 238 



The Time- and Mass-relations of Digestion and Absorption 250 



PART II. 



THE PROPERTIES OF PROTOPLASM. 



CHAPTER XII. 



PROPERTIES CONFERRED BY THE DIFFUSIBLE CONSTITUENTS. 



The Osmotic Pressure of the Tissue Fluids 255 



The Osmotic Pressure of Cell Contents 263 



The Composition of the Mineral Constituents of Tissue Fluids .... 268 



The Neutrality of the Tissues and Tissue Fluids 271 



