Popular Books on Natural Science

er, it consists of blood, flesh, and bones, which heretof

self, and by its breath secretes carbon in the form of carbonic acid. Its skin begins to perspire, and secretes chiefly hydrogen and oxygen in the shape of water or vapor; by the urine, finally, it secret

for this loss. This is given by the mother's mil

is this

quality of preparing the milk for the necessary change which will take place, when it reaches the child's stomach. The principal work, however, is carried on in the stomach itself

n, that is, the transformation of solid food-the crust of bread, meat, etc.-into a p

ng the process of digestion, was closed by a muscle, opens itself. The pulp, now called "chyme," flows into the co

l the chyme separates into two parts; one of them, a milky fluid called "chyle," contains the substance which feeds th

t, the chyle, conveyed into t

tion, on account of the great length of the intestinal canal-in adults it is nearly thirty feet long-is, in a healthy body, accompli

vessel which ascends into the chest; here it empties into a large blood-vessel, the blood of which is on its

milar to the blood, joins the blood after a circuitous journey, a