2247. Made by H. J. Baker & Bro., 215 Pearl St., N. Y.

*Reckoning the phosphoric acid at 7 cents per pound and the potash at 5 cents.

Castor pomace, like cotton seed meal, has been one of the cheapest sources of available nitrogen this season.

II. RAW MATERIALS OF HIGH GRADE CONTAINING PHOSPHORIC

ACID.

THOMAS SLAG AND NATIVE PHOSPHATES.

The following were used in the field experiments carried out in various parts of the state for this Station and which are described in the latter part of the present report.

2194. Thomas Slag or Thomas Phosphate Meal, a by-product of the manufacture of steel from ores containing phosphorus. Bought of Paul Weidinger, 76 Pine St., New York City.

2193. Ground South Carolina Rock. Purchased for the Station by the Mapes Formula and Peruvian Guano Co., New York City.

2195. Grand Cayman's Phosphate. A phosphatic deposit from Grand Cayman's Island. Bought of N. P. Powter, New York City.

2397. Bolivian Guano. A phosphatic guano from the West Indies, sold by the Quinnipiac Fertilizer Co., and bought from their agent, R. B. Bradley & Co., New Haven.

DISSOLVED BONE BLACK.

This material is a superphosphate prepared by treating refuse bone black from sugar refineries with oil of vitriol which renders nearly all of the phosphoric acid soluble in water.

Phosphoric acid in dissolved bone black is considerably more expensive than in dissolved South Carolina rock, but the latter material does not get into the retail market in this state for some reason, perhaps for a lack of a demand for it. Phosphoric acid in dissolved rock was bought in New Jersey for about 6 cents a pound the last year, and granges or farmers' clubs that buy in considerable quantity would do well to inquire for it.

2182. Sold by L. Sanderson, New Haven, guaranteed 16-18 per cent. available.

2214. Sold by C. Meyer, Jr., Maspeth, L. I., guaranteed 16-18 per cent. available. From stock bought by G. F. Platt, Milford. 2223. Sold by C. Meyer, Jr. Sampled and sent by C. T.

Merwin & Son, Milford.

2228. Sold by C. Meyer, Jr. Sampled and sent by Dennis.

Reckoning the reverted acid at 71⁄2 cents and insoluble at 2 cents per pound.

III. RAW MATERIALS OF HIGH GRADE CONTAINING POTASH.

SULPHATE OF POTASH.

The double sulphate of potash and magnesia is usually sold as "sulphate of potash" on a guarantee of "48-50 per cent. sulphate" which is equivalent to 25.9-27 per cent. of actual potash. It contains, besides some 46-50 per cent. of sulphate of potash, over 30 per cent. of sulphate of magnesia, chlorine equivalent to 3 per cent. of common salt, besides sulphates of soda and lime, with varying quantities of moisture.

Attention is called to the high grade sulphate containing about 94-95 per cent. of pure sulphate of potash. The cost of actual potash is somewhat higher in this than in the double sulphate of potash and magnesia.

2178. Double sulphate of potash and magnesia. Stock of L. Sanderson, New Haven.

2209. High grade sulphate of potash, guarantee 95 per cent. sulphate. Sold by C. Meyer, Jr., Maspeth, L. I. From stock bought by G. F. Platt, Milford.

2225. High grade sulphate of potash. Sold by C. Meyer, Jr. Sampled and sent by Dennis Fenn, Milford.

Commercial muriate of potash contains about 80 per cent. of muriate of potash (potassium chloride), 15 per cent. or more of common salt (sodium chloride), and 4 per cent. or more of water. It is generally retailed on a guarantee of 80 per cent. muriate, which is equivalent to 50.5 per cent. of actual potash.

2168. From stock bought of L. Sanderson, New Haven. Sampled and sent by J. J. Webb, Hamden.

2177. Stock of L. Sanderson, guarantee, 80-85 per cent. muriate.

2188. Stock of the Rogers & Hubbard Co., Middletown, guarantee, 80 per cent. muriate.

2212. From stock bought of C. Meyer, Jr., Maspeth, L. I., by G. F. Platt, Milford. Guarantee 82 per cent. muriate. 2221. From stock bought of C. Meyer, Jr.

by C. T. Merwin & Son, Milford.

Sampled and sent

2226. From stock bought of C. Meyer, Jr. Sampled and sent

by Dennis Fenn, Milford.

The terms 66 Bone Dust," ""Ground Bone," "Bone Meal" and "Bone" applied to fertilizers, may in some cases, signify material, made from dry, clean and pure bones such as shank bones used in making knife handles; in other cases these terms refer to the result of crushing fresh or moist bones which have been thrown out either raw or after cooking, with more or less meat, tendon and grease and if taken from garbage or ash heaps, with ashes or soil adhering; again they denote mixtures of bone, blood, meat and other slaughter-house refuse which have been cooked in steam-tanks in order to recover grease, and are then dried and sold as "tankage ;" or, finally, they apply to bone from which a large share of the nitrogenous substance has been in extracted in the glue manufacture. The nitrogen of all these varieties of bone when they are in the same state of mechanical subdivision has essentially the same fertilizing value.

Since it now rarely happens that ground bone or tankage is to any considerable extent coarser than inch, the valuation this year is made on four grades only, viz:

On pages 40 to 43 will be found the tabulated analyses of 25 different brands of this class.

Station
No.

Name or Brand.

BONE MANURES.-SAMPLED BY THE STATION.

Manufacturer.

Dealer.

Peter Cooper's Glue Factory, 17 Bur- Chas. Jennings, Southport.
ling Slip, N. Y.

Peter Cooper's Glue Factory, 17 Bur- Apothecaries Hall Co., Waterbury.
ling Ship, N. Y.
Wilson & Burr, Middletown.
Geo. Beaumont, Wallingford.

H. J. Baker & Bro., 215 Pearl St., New C. O. Jelliff & Co., Southport.
York City.

Quinnipiac Co., New London, Ct.

Harry Sedgwick, low.

Cornwall