23 



showed the guarantees to be well maintained in all instances." Copies of 

 these analyses were submitted to the experiment station by the company's 

 manager. 



Lowell Fertilizer Co. — Lowell 2-8-4 Brand, No. 614: nitrogen found, 1.67 

 per cent., guaranteed, 1.64 per cent.; available phosphoric acid found, 8.09 

 per cent., guaranteed, 8 per cent.; potassium oxide found, 3.59 per cent., 

 guaranteed, 4 per cent. 



Another sample of the same brand did not show a commercial shortage. 



Lowell 2-8-2 Brand, No. 616: nitrogen found, 1.50 per cent,, guaranteed, 

 1.64 per cent.; available phosphoric acid found, 8.11 per cent., guaranteed, 

 8 per cent.; potassium oxide found, 1.88 per cent., guaranteed, 2 per cent. 



Lowell 4-8-4 Brand, Nos. 236, 255: nitrogen found, 3.24 per cent., guar- 

 anteed, 3.28 per cent.; available phosphoric acid found, 8.50 per cent., guar- 

 anteed, 8 per cent.; potassium oxide found, 3.65 per cent., guaranteed, 4 per 

 cent. 



Mapes Formula & Peruvian Guano Co. — Mapes Corn Manure, 1916, Nos. 

 756, 761 : nitrogen found, 2.55 per cent., guaranteed, 2.47 per cent.; available 

 phosphoric acid found, 7.73 per cent., guaranteed, 8 per cent.; potassium oxide 

 found, .54 per cent., guaranteed, 1 per cent. 



Another sample of the same brand, although somewhat deficient commer- 

 cially, showed a much better condition. Nos. 311, 350, 635, 682: nitrogen 

 found, 2.61 per cent., guaranteed, 2.47 per cent.; available phosphoric acid 

 found, 8.96 per cent., guaranteed, 8 per cent.; potassium oxide found, .57 

 per cent., guaranteed, 1 per cent. 



National Fertilizer Co. — National Pine Tree State Potato Manure, No. 

 57: nitrogen found, 3.22 per cent., guaranteed, 3.29 per cent.; available phos- 

 phoric acid found, 7.84 per cent., guaranteed, 8 per cent.; potassium oxide 

 found, 3.64 per cent., guaranteed, 4 per cent. 



Another sample of the same brand was found well up in all three ingre- 

 dients. 



National Extra High Grade Potato Fertilizer, No. 143: nitrogen found, 

 4.12 per cent., guaranteed, 4.11 p^r cent.; available phosphoric acid found, 

 10.69 percent., guaranteed, 10 per cent.; potassium oxide found, 3.45 per 

 cent., guaranteed, 4 per cent. 



Ross Bros. Co. — High Grade Potato and Vegetable Fertilizer, No. 671: 

 nitrogen found, 1.74 per cent., guaranteed, 2.88 per cent.; available phosphoric 

 acid found, 9.19 per cent., guaranteed, 8 per cent.; potassium oxide found, 

 3.35 per cent., guaranteed, 3 per cent. 



Another sample of this brand, No. 928, collected at a later date, gave the 



