FOOD FOR PLANTS 23 



Lower prices can be obtained by buying fertilizing 

 materials in carload lots. If you cannot use a car- 

 load yourself, get your neighbors to join with you. 

 Much money has often been saved in this way. 



In buying, always consider the percentage of 

 availability. 



This may be illustrated by comparing gold ores of 

 the same percentages derived from different sources, 

 — one gold ore containing ten ounces to the ton 

 might be worth a great deal of money per ton, — that 

 is to say, if the gold were extractable with ease and 

 without undue expense, — whereas another ten-ounce 

 ore might contain its gold in such form as to 

 be extracted only with great difficulty and at great 

 expense. 



