Popular Books on Natural Science

substances. These are principally oxygen, hydrogen, and nitrogen; three gases to which may be added a large quantity of carbon, or, what is

ge ingredients nature has carefully transformed into milk. For in their primary state, and even in various chemical combinations that may be produced artificially, they would be little adapted for the purp

plant is nothing but transformed primary elements! Not before the transformation o

ow, it is true that man also eats the flesh, fat, and eggs of animals; but

The primary elements nourish the plant; the plant nourishes the

that the mother has eaten vegetable and animal matter. This food, prepared for the mother by nature, has be

hemical primary elements. But these substances when appearing in the shape of milk, are combined in such a manner as

e substances after they have been eaten by the child? How are they changed during the time of their stay in th

ted to turn our attention to a further question, viz., "What articles of food are the most advantageous to man from the time he is wean

attain the end in a shorter time than would have been possible otherwise. We trust that we may give our reader a correct idea of the subject, if he will but