An Incessant Want

One of the moessant wants bf man is air. JVewant air iuiuly to nourish us and keep us cool The qi-.ai.tity of air inhaled by an adult in tvventy-four hours amounts on au averge to about three hundred cublc feet. ör two th.ousand gallous. What we to.ke in and gíve out during twenty-four houra in the shape of solid and liquid food ocoupies on an average the space of uve and a half pinte, whieh is equal to oiie three-hundredth of the volume of air passing through our luugs. u Wi astonisl1 yo to hear, perhaps tor the first time, that thia amounts to seven hundred and thirty thousand gallons in one year, and to be reniindedof tbat contmuous work which goes on day and night - a never-oeasing bellows-blowing- by whxch the organ of our life is kept in play. Of course, the quantity of air flowing around the surface of the human body is greater than that. Do not object that air is sometimes so light that it need not be taken iuto account. It has some weight; water is certainly seven hundred and seventy times heavier, but our aaily two thousand gallons have for all that a weight of twenty-five pouuds avoirdupois.