Bowker's "Stockbridge" s=„ Manures 
THE ORIGINAL SPECIAL FERTILIZERS. 
(iNTfJODUCED 1875.) 
^ There is nothing which equals ^ 
yjly^ Stable manure in every respect, 
But Bowker's Stockbridge Manures are excellent substitutes, 
And for some crops superior to it. 
BOWKER'S Stockbridge Manures, "double strength," manufactured by Bowker Fertilizer Company, contain on the average 
twice as much plant-food as the ordinary fertilizers, so that one ton of Stockbridge will go further and cost less than two tons 
of other kinds. Therefore thrifty farmers buy the Stockbridge for economy's sake, if for no other reason. 
WHAT IS THE STOCKBRIDGE PRINCIPLE? V 
The Stockbridge Special Complete Manures were originated by Professor Levi Stockbridge, of the Massachusetts Agricultural 
College. They were the first special manures introduced in this country, and are founded on the principle of supplying the crop, in 
suitable proportion, association, and form, with that plant-food" which it requires, and which it cannot obtain for itself from the soil 
or air in sufficient quantity, the supply being based upon an analysis of the crop and its habits and conditions of growth. 
