executive ability, is all that can be attempted in a primary course.


FOOTNOTE:

[3] An illustration of vapor rising may be given by breathing upon a
mirror.




CHAPTER II.

Food Classification.


The following are familiar examples of compounds of each of the four
principal classes of nutrients:

PROTEIN:

_Proteids._

_Albuminoids_, _e.g._, albumen of eggs; myosin,
the basis of muscle (lean meat); the albuminoids
which make up the gluten of wheat, etc.

_Gelatinoids_, constituents of connective tissue which
yield gelatin and allied substances, _e.g._, collagen
of tendon; ossein of bone.