Chapter 1

THE PHYSICAL BASIS.

LETTER PAGE I. To a young man of letters who worked excessively 17

II. To the same 22

III. To a student in uncertain health 27

IV. To a muscular Christian 42

V. To a student who neglected bodily exercise 47

VI. To an author in mortal disease 53

VII. To a young man of brilliant ability, who had just taken his degree 57