The literary digest . nkly branded and ad-vertised. The name KEYSTONE stands for all thatis best in Copper-Steel Sheet and Tin Mill Products. Apollo i^;^ X Roofing Products as formed from Apollo-Keystone CopperSteel Galvanized Sheets are most durable andrust-resistant. Actual time and service haveproved that high grade steel alloyed with acertain percentage of Copper will withstandrust and corrosion to the highest possible de-gree. This material assures long life and satis-factory wear from all forms of exposed sheetmetal work. Look for the added Keystone,it indicates that copper-steel is
The literary digest . nkly branded and ad-vertised. The name KEYSTONE stands for all thatis best in Copper-Steel Sheet and Tin Mill Products. Apollo i^;^ X Roofing Products as formed from Apollo-Keystone CopperSteel Galvanized Sheets are most durable andrust-resistant. Actual time and service haveproved that high grade steel alloyed with acertain percentage of Copper will withstandrust and corrosion to the highest possible de-gree. This material assures long life and satis-factory wear from all forms of exposed sheetmetal work. Look for the added Keystone,it indicates that copper-steel is used Keystone Copper Steel is suppliefl in our Apollo-Kovstone Gal-vanized Sheets, Apollo RooGni; Prodiicis, and in lilack Sheets. Key-BroNE is also unequaled fnr Koofinc Tin Plates. This Company manu-faetures Sheet and Tin Mill Prortueis of eierv description and forevery known purpose. Shall we send our Better Buildings booklet? AAIERICAN SHEET AND TIN PLATE COMPANY, General Offices: Frick Buildiirj;. Pittsburgh, AUTOMOBILE STARTINGtiGHTING & LAMPS 1 9 ^>^^ m Quality systems ^T^HE high-class car invariably-^ carries high-class & Davis starting-lightingsystem is found on Quality carswhere efficiency, rather thanprice, is of first importance. GRAY & DAViS INC. BOSTON, MASS. f M SCIENCE AND INVENTION Continued on between the producers and milk-dealerson this continent during the past twoyears. . Statistics are difficult to ob-tain; but it is probable that in no one par-ticular have the infants and children of thepoorer people been affected more. seriouslythan in a lessened milk-supply; while, asfor eggs, their use would seem to have beenrestricted largely to the wealthy and tothose provident householders who havekept a dozen hens and fed them on gardenand household refuse. If milk foods, suchas cheese, have been increased for export aswar-food at the expense of the cliildrensfood, it could only be excused on theground of some pressing necessity, but wehave
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