WE CARRY A FULL LINE OF INSECTICIDES 29 

Why quality oils? Farm machinery is only as eff- 
cient as its lubrication. Inferior oils break down 
under heat and pressure and cease to lubricate. 
Moving parts are then worn away by friction. 
Quality oils and greases are made to withstand these 
conditions. They stay put where inferior motor oils and 
greases break down, leaving a raw surface to grind away 
and create trouble and repair bills. 
Thousands of Illinois Farmers are 
familiar with the HIGH QUALITY of 
BLUE SEAL 
OILS and GREASES 
These farmers should be! They saw to it that their own company 
produced quality products! BLUE SEAL petroieum products are 
made from the best quality stocks and are tested regularly at our 
own laboratory at Naperville, Illinois. A staff of laboratory tech- 
nicians make chemical analyses of these products before and after 
being used. Thus Blue Seal quality standards are maintained. 

ALSO 
Penn-Bond Oils; Pure Pennsylvania Crude; Dual Duty 
Oils for special work; Master Oil for Heavy Work. 
SOLD BY 
LAKE-COOK FARM 
SUPPLY COMPANY 



