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H e was, but his sensations were apt to prove true and it i s already evident that he w a s too near right for comfort. Before w e were half w a y to the date he set we had two wheatless days a week, though that was because we persisted in shooting nitrates into the air. The area producing wheat was by d e c a d e s : x THE WHEAT FIELDS OF THE WORLD Acres 1881-90 192,000,000 1890-1900 211,000,000 1900-10 242,000,000 Probable limit 300,000,000 If 300,000,000 acres can be brought under cultivation f o r wheat and the average yield raised to twenty bushels to the acre, that will give enough to feed a billion people if they eat six bushels a year as do the English.

Kow guncotton look* IJICM rommmi rotton, It in t o o light and loom* to park w**ll into A gun. 8 0 it in dinsolved with ftthtr IIIH} alt'ohnl or iicwtoitft tn tnnkt* n pla»tic5 m a m that can fw molded tutu rmh nnd irtit into grains of i u i t a b k nhapt iind mm. in burn nt tin* H t r t . thtfti, Wf h«vi* a liquid «*xpttniivo# 18 CBEATIVE CHEMISTRY that has to be soaked up in some poroun «olitlf and A porous solid, guncotton, that has to aonk u p nome liquid. W h y not solve both difficulties together by dissolving the guncotton in the nHroKlywrin ami no get a double explosive!

If nir in fwrc*i*tt into umitlipr ^pnei^ as in a tiro pump, it heats lap iiinl if i*Jbwi*«i to e x p a n d to ordinary pressure it eonl* off again. x|mnding a great detl of air, a littk of it can lm ritdliieatl t o the liquefying p o i n t A t Mundta Sbaal* flic? p l a n t for liquefying air, in order to get tho nitrogen out o f it f consisted of two d o w n towers t a t h capable of produo* ing 1765 cubic feet of pure nitrogen p w bcttar, T h e a i r was drawn in through two pipes, m yard aero**, a n d passed through scrubbing towtrs to r f f u w t impuritic*H.

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