The above rules embody our preachment on individual hygiene. We have
stated them as fifteen separate kinds of procedure. In actual life,
however, our acts can not be so separated. The neglect or observance of
one rule carries with it, to some extent, the neglect or observance of
other rules. For instance, one can not take muscular exercise without,
to some extent, taking breathing exercises. Swimming serves as a means
of cleanliness, of skin gymnastics, of general exercise and of
amusement. A game of tennis implies the practise, to some extent, of at
least five of the fifteen rules.
