LESSONS ON HEALTH.

Temuka Leader, Volume 2, Issue 141, 30 April 1879, Page 3

LESSONS ON HEALTH.

— Sin,—l think your young readers have become so much interested in the Science Primer upon Health that "they will like to hear a little more of what it tells about the air we breathe. It says that in good air there arc mainly two sorts of gas. The first is a very active gas. called oxygen, which joins with other- things , and burns them. We could not live in it, were it not mixed with a dull gas called nitrogen, which weakens it. When we breathe the air goes into our lungs, which are something like large sponges. . These sponges are full of an immense quantity of little blood-vessels, and an innumerable quantity of little air vessels, so that the blood almost touches the air : there is only a very thin skin between them. Through that skin the blood sends away waste and useless water, carbonic, acid gas, and animal matter, and takes in fresh oxygen, which the body wants. This bad air when first breathed is warm, and being lighter than cold air it rises to the ceiling. Therefore, if the top oF the window is a little open it will find its way out. If it cannot get out, then those who breathe it all night arc languid, unrefreshed, pale, and cross in the morning. I will say no more about this little book, except to advise my young readers to get it. The price is only Is 3d. I am, &c, Uncle Ben, Dunedin.