233 REporT OF THE CHEMIST OF THE 
(3) Available Phosphoric Acid— The 101 brands of com- 
plete fertilizers contained available phosphoric acid varying in 
amount from 3.44 to 13.08 per ct. and averaging 9.04 per ct. 
The average amount of available-phosphoric acid found by the 
Station analysis exceeded the average guaranteed amount by 0.74 
per ct., the guaranteed average being 8.30 per ct. and the average 
found being 9.04 per ct. 
In 87 brands of complete fertilizers, the amount of available 
phosphoric acid found was above the amount guaranteed, the ex- 
cess varying from 0.03 to 3.28 per ct. and averaging 0.93 per ct. 
In 14 brands, the available phosphoric acid was below the guar- 
anteed amount, the deficiency varying from 0.04 to 2.64 per ct. 
and averaging 0.49 per ct. In 10 cases the deficiency was below 
0.05 per ct. 
The amount of water-soluble phosphoric acid varied from 0.40 
to 10.80 per ct. and averaged 6.07 per ct. 
(4) Potash.— The complete fertilizers contained potash vary- 
ing in amount from 0.48 to 10.75 per ct. and averaging 4.30 per 
ct. The average amount of potash found by the Station analysis 
exceeded the average guaranteed amount by 0.22 per ct., the guar- 
anteed average being 4.08 per ct. and the average found being 
4.30 per ct. 
In 74 brands of complete fertilizers, the amount of potash found 
was above the guaranteed amount, the excess varying from 0.01 
to 2.75 per ct. and averaging 0.54 per ct. 
In 27 brands, the potash was below the guaranteed amount, the 
deficiency varying from 0.01 to 3.72 per ct. and averaging 0.65 
per ct. In 15 of these cases the deficiency was less than 0.5 per ct. 
In 15 cases among the 101 brands of complete fertilizers the 
potash was contained in the form of sulphate free from an excess 
of chlorides. 
(5) The retail selling prices of the complete fertilizers varied 
from $16.50 to $35.00 a ton and averaged $23.25. The retail 
