xiv CONTENTS 



PAGE 



tions. Localizing power of retina. Color vision. Function of the 

 cones. Distribution of color sense over the retina. Color blindness. 

 After-images. Contrasts. Theories of color vision. Visual percep- 

 tions. Single vision with two eyes. Perception of solidity . . . 231 



CHAPTER XVII 



THE STRUCTURE AND FUNCTIONS OF BLOOD AND LYMPH 



The external medium. The internal medium. The blood. The lymph. 

 Filtration, osmosis, and dialysis. Renewal of the lymph. Lym- 

 phatic vessels. Lacteals. Composition of blood. Red corpuscles. 

 Hemoglobin. Leucocytes. Blood-plates. Blood-plasma. His- 

 tology and chemistry of lymph 254 



CHAPTER XVIII 



THE HORMONE-CARRYING AND DISEASE-RESISTING FUNCTIONS OF 

 THE BLOOD. BLOOD-CLOTTING 



Hormones. Ductless glands. Thyroid. Parathyroids. Thymus. Pi- 

 tuitary. Adrenals. Infection. Resistance to infection. Recovery 

 from infection. Opsonins, immune bodies, and agglutinins. An- 

 titoxin. Immunity. Inoculation. Coagulation of blood. Blood 

 transfusion 270 



CHAPTER XIX 



THE ANATOMY OF THE HEART AND BLOOD-VESSELS 



General statement. Position of heart. Membranes of heart. Anatomy 

 of heart. Valves of heart. The arterial system. Aorta and its 

 branches. The capillaries. The veins. The pulmonary circulation. 

 The portal circulation. Arterial and venous blood. Structure of the 

 arteries, of the capillaries, and of the veins 288 



CHAPTER XX 



THE ACTION OF THE HEART. THE REGULATION OF THE HEART-BEAT 



The beat of the heart. Cardiac impulse. A cardiac cycle. Use of papil- 

 lary muscles. Sounds of the heart. Action of the heart valves. 

 Function of the auricles. Work done by the heart. Relation of 

 nerve and muscle elements within heart. Peculiarities of heart. 

 Passage of beat over heart. Neurogenic and myogenic theories of 

 heart-beat. Nature of automatic rhythmicity. Extrinsic nerves of 

 heart. Inhibitory and augmentor centers 304 



