by those who have authority on the subject.

Let it suffice you, for to-day, to have gained some idea of the manner
in which the materials which constitute our bodies are manufactured
within us. We have got at this by talking of the teeth; to-morrow, it
may be the saliva, the next day something else. What I have now told
you will be of use all the way through, and I do not regret the time
we have given to the subject. If you have understood that well; the
time has not been lost.



LETTER V.

THE TEETH _(continued.)_

My thoughts return involuntarily to the subject I last explained to
you, my dear child, and I find that I have a great deal to say about
it still.

You see now, I hope, that we have something else to consult besides
a dainty taste when we are eating; and that if we are to work to any
good purpose we must think a little about this poor blood; who has so
much to do, and who often finds himself so much at fault, when we send
him nothing but barley-sugar and biscuits for his support. It is not
with such stuff as that, as you may well imagine, that he can be enabled
to answer satisfactorily to the constant demands of his little workmen,
and we expose him to the risk of getting into disgrace with them, if
we furnish him with no better provisions.