THE 
GARDEN YARD 256 
or, in other words, 20 pounds. For example, if 
kainit contains 12 per cent. of potash and is 
sold at $12.00 per ton, then there are 12 units 
and they cost $12.00; therefore one unit costs 
$1.00, and since the unit is 20 pounds, the actual 
cost of the potash is 5 cents per pound. If 
muriate of potash, guaranteed to contain the 
equivalent of 50 per cent. of potash, is selling 
at $40.00 a ton, then we find that 50 per cent. 
potash is 50 units; if 50 units cost $40.00, one 
unit will cost 80 cents, or in this form 20 pounds 
cost 80 cents; therefore one pound will cost 
4 cents. 
Now, if these are prices free on board the cars 
at New York, and potash is the thing we need, 
we must remember that in order to get equal 
amounts of potash delivered to our own farm, 
we must pay freight and haul four tons of 
kainit instead of one ton of muriate of potash. 
In other words, with these figures the higher- 
priced fertilizer, counting in dollars per ton, is 
really the cheaper article, counting in value. 
Any one who will secure the latest fertilizer 
bulletin from the nearest Experiment Station 
will usually find the approximate values of one 
pound of nitrogen, phosphoric acid and potash 
in the different fertilizers worked out in some 
part of the bulletin. These may be used in 
