The new century primer of hygiene, for fourth year pupils,
Book Description
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...XVI HOW THE BLOOD IS PURIFIED Every morning after we get up from our beds we throw them open and open the windows to let the fresh air blow upon them and purify them. When clothing h...
MoreThis historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1901 edition. Excerpt: ...XVI HOW THE BLOOD IS PURIFIED Every morning after we get up from our beds we throw them open and open the windows to let the fresh air blow upon them and purify them. When clothing has been hanging in closets or packed away in trunks or chests, we take it out and hang it on a line for the air to blow through it and purify it. If any utensils about the house get a bad odor they are put out into the air to sweeten. Dirty clothes are washed in water and then hung out to dry in the open air. If they are dried by steam heat instead of by sunlight and air, they do not have the same sweet smell, and are really not so clean. The blood in the body is also purified by the air. Put your hand upon your chest and breathe. See how much larger it becomes when you draw in your breath. That is because you make the chest larger and that allows the air to flow in. How does the air get into the body, and how does it get into the blood? Close your mouth and you can feel the air passing through the nose. Always take it in that way, for there are little hairs in the nose which keep any dust particles from going through. It is warmed there, too, before going to more tender parts. From the nose the air goes into the throat and down the windpipe. At the end of the windpipe there are two branches, one going to each side of the body into the lungs. See how the large tubes branch again and again, until they become very fine indeed. At the end of each tiny tube is a little bladder or sac. When the air is drawn in it passes through these large tubes and then through the little ones, until it gets into the air sacs at the end. The skin of these sacs is so thin that the air can pass through. Just where these air sacs are there are many, many of the tiny blood vessels which we...
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