xiv THE JOUENAL OF THE MINISTRY OF AGRICULTURE. — Advertisements. 



OFFICIALLY APPROVED BY CHARLES Y. KNIGHT 

 FOR SLIDE-VALVE ENGINES. 



" The only Oil 

 for Tractors." 



THE BRITISH MONOGRAM OIL CO. (1919) LTD., 

 Monogram Works, Acton Vale, V/.3. 



'PhoDe Xo.: 1012 Chiswiek. 'Grams: "Oflogramic, London" 



