CONTENTS. xiii 
MECHANISM OF BILE SECRETION. 
By D. NOEL PATOX. 
Mode of Formation of Bile Constituents — Water — Inorganic Salts — Nucleo- 
Proteid — Bile Acids — Bile Pigments — Cholesterin — Lecithin, etc. — Influence 
of Various Factors on the Secretion of Bile — Flow of Blood — Food — 
Pressure of other Organs — Nerves — Chemical Substances — General Con- 
clusions page 559 
THE CHEMISTRY OF THE TJEINE. 
By F. GOWLAND HOPKINS. 
Introductory — Quantitative Composition of Urine — Variations in its Amount and 
Specific Gravity — Its Chemical Beaction — The Nitrogenous Constituents : 
Total Nitrogen ; Urea ; Ammonia ; Uric Acid ; Xanthin Bases ; Creatinin ; 
Hippuric Acid ; Amido-Acids — Proteids — The Aromatic Substances — The 
Carbohydrates — Glycuronic Acid and its Conjugated Compounds — Oxalic Acid 
— Acids and Oxyacids of the Fatty Series — Colour of the L'rine and the 
Chemistry of its Pigments : The Preformed Pigments of Normal Urine ; 
Chromogenic Substances ; The Pigmentation of Pathological Urine — The In- 
organic Constituents — General Characteristics of the Organic Urinary Com- 
pounds — Comparative Chemistry of the Urine .... page 570 
THE MECHANISM OF THE SECRETION OF URINE. 
By ERNEST H. STARLING. 
Theories of Urinary Secretion — Theory of Bowman — Theory of Ludwig — Secretion 
of Water — Methods — The Concentration of the Urine — Heidenhain's Criticism 
of the Theory of Ludwig — Experiments of Nussbaum — Experiments of Ribbert 
— Experiments of Bradford — The Influence of the Nervous System on the 
Secretion of Urine page 639 
THE MECHANISM OF THE SECRETION OF MILK. 
By E. A. SCHAFER. 
General Considerations — Influence of the Nervous System — Action of Pilocarpine 
and Atropine — Influence of Diet — Place of Formation of the Organic Con- 
stituents — Manner in which the Secreted Materials pass out of the Cells — 
Mechanism of the Discharge of Milk ...... page 662 
SECRETION AND ABSORPTION BY THE SKIN. 
By E. WAVMOUTH REID. 
Chemical Nature of Skin Secretions — The Secretion of Sweat — Electro-Motive 
Phenomena in Skin Glands — Absorption by the Skin of Man — Of Lower 
Mammals— Of the Frog . page 669 
