In circulation of blood, 311.
In digestion, 310.
Purposes of, 311.

Reflex action and mind, 308.

Reflex action pathway, 309.

Refraction, 371.

Rennin, 149.

Respiration, 76-103.
Artificial, 97.
Internal, 89.
Lung, 76.

Retina, 376.

Retinitis, 333.

Rheumatism,
Effects on the heart, 56.
Sequel to other diseases, 407.

Right lymphatic duct, 67.

Rods and cones, 377.

Rods of Corti, 364.

Sacrum, 224.

Saliva, 145.
Composition of, 145.
Uses of, 145.
To show action on starch, 171.

Salivary glands, 144.
Kinds of, 144.
Reflex action of, 323.

Sanitation, defined, 2.

Sarcolemma, 244.

Sarcoplasm, 244.

Scala media, 363.

Scala tympani, 363.

Scala vestibula, 363.

Scarlet fever, care after, 211.

Sciatic nerve, 302.

Sclerotic coat, 374.

Secondary reflex action, 314.

Secretions, 197.
Kinds of, 200.

Secretory process, nature of, 199.

Seeing, problem of, 372.

Self-control, 326, 334.
Habit of, 325.

Semicircular canals, 362.

Semilunar valves, 44.

Sensations, 338-349.
Classes of, 339.
Production of, 338, 349.
Purposes of, 340.
Special, 340.

Sensations (_continued_).
Steps in production of, 341.

Sensation stimuli, 339.

Sense organs, simple forms of, 341, 342

Serous coat, 140, 148.

Serous membrane, 264.

Serum albumin, 30.

Serum globulin, 30.

Shortsightedness, 384.

Shoulder girdle, 226.

Sight, organs of, 373.

Sigmoid flexure, 158.

Simple life, 410.

Skeleton, 216-243.
How deformed, 234.
Hygiene of, 233.
Plan of, 221.
Purpose of, 221.

Skin, 264-277.
As regulator of temperature, 270.
Experiments on, 349.
Functions of, 267, 268.
Observations on skin, 278.

Skin wounds, treatment of, 275.

Skull, 225.

Sleep, 329.

Small intestine, 151.
Mucous membrane of, 151.
Muscular coat of, 152.
As organ of absorption, 173.
Parts of, 151.
Serous coat of, 152.
Work of, 157.

Smell,
Sensation of, 346.
Value of, 347.

Sneezing, 81.

Sodium, 135.

Sodium carbonate, 155.

Sodium chloride, 122.

Soft palate, 141.

Solution, 131.
Kinds of, 73.

Solution theory, 156.

Solvents, 131.

Sound,
To illustrate origin of, 367.
To show transmission of, 367.

Sound waves,
As stimuli, 331.
Nature of, 350.
Reenforcement of, 352.
To show effects of, 368.
Value of, 353.

Speech, production of, 357.

Spinal column, 223-225.
Hy