Part 3

Man's Animal Kinship 1265

Lesson XX

SEX AND HEREDITY 1277

The Origin of Sex 1279

A Rational View of Sexual Health 1285

Embryological Growth--Prenatal Culture 1289

Heredity 1293

What Heredity Is 1295

Summary of Facts regarding Sex and Heredity 1297

Lesson XXI

REST AND SLEEP 1299

Rest 1301

The Old Physiology 1305

Rest and Recreation 1306

Sleep 1308

Some Reasons 1310

Oxidation and Air 1312

Lesson XXII

A LESSON FOR BUSINESS MEN 1315

A Good Business Man 1320

The Routine Life of the Average Business Man 1322

Some Suggestions for a Good Business Man 1324

Lesson XXIII

EXERCISE AND RE-CREATION 1327

Exercise 1329

Constructive Exercises 1330

Exercise for Repair 1331

Physiology of Exercise 1333