16 PHYSIOLOGY AND ANATOMY. 
again a little substance, when by-and-by it becomes flesh and 
skin. When a bone is broken, just the same process goes 
on, only the substance left is a little harder, tilla piece of © 
bone is formed. Should you hurt your finger-nail so that 
it peeled off, you would find that gradually a new nail would 
grow on, but if you should eat very sparingly for two or 
three months, you would not see this growth. - 
Different kinds of food make different quantities of chyle 
and different kinds of blood. Animal substances make more 
chyle than vegetable—hence, if we lived altogether on meat 
and animal food we should not require so much in quantity. 
When Nature does any thing, she is governed by regular 
rules and fixed laws, and is systematic in all her arrange- 
ments. She does one thing at a time, and is only” capable of 
doing a certain come: and.1 ection without inj uring 8 some 
or rious ant ee 
organs | in our whole ody. If this be affected, our whole 
bodies are affected. We may injure our arm and still beable _ 
to walk, to think, and talk. The same may be true with re- 
gard to a leg or foot, but if the stomach be sick, we can, 
neither walk, run, nor use our limbs, and sometimes can. not 
eyen think. It is always performing its duties faithfully, 
whether we are eating, sleeping, or walking. Man has only 
one stomach, but if we overload this organ it loses its power 
of producing the fluid which is necessary. 
I will next tell you of the bones, the skin, and the heart. 
Our bones are all joined together and make what is called 
the human skeleton. Our skeleton not only serves as a sup- 
port, but also enables us to perform all our motions. “In this . 
view we divide bones into two kinds—those which protect 
