Show A Ventilation Test It Is very hard to make an impression impres-sIon on those people who defend their possessions on all occasions A lady was explaining to a visitor the many advantages of concrete hollowblock construction of which the walls of her new home were built The air spaces in tho walls afford Insulation against heat in summer and cold in winter she explained Besides Be-sides such walls afford ventilation and insure a more healthful house The visitor reflected a moment and replied OuiVramo house must bo quito as well built Every night we lock the cat In the cellar and havo to let her out of the attic In tho morning Youths Companion |