Chemical composition of black pepper.—The analysis of the pure ground pepper shows the amount of water to be between 8 and 10 per cent., but, of course, it varies with surrounding conditions. The ash in black peppers does not exceed from 4-10 to 7-10 per cent., and in white, 4-10 per cent.; it is fair to believe that anything above 5 per cent. for black and 2 per cent. for white is suspicious. The volatile oil, to which pepper owes its flavor, varies in black pepper from 1.69 to .70, and in white 1.26 to .57 are found, but this determination is not of great value as a means of detecting adulterations. Piperine, which is a neutral crystalline substance, and resin, to which the pepper owes its pungency, of which it yields about two per cent. in its composition, are similar to oil of turpentine as well in specific gravity as in the boiling point. These substances furnish a most valuable check on the purity of both white and black pepper. Pepper contains from 7.90 to 7.24 per cent. of these substances, showing a great constancy in amount, and on addition of adulterants, this is plainly affected, which seems better than a determination of pure piperine, which is difficult and causes much loss. It has also proved impossible to make determinations of piperine by the combustion, or K. Jeldahl, methods by application of Stutzer’s copper-hydrate process, the percentage of nitrogen being so small, 4.912 in piperine, as to make the error very large when converting the former to the latter, the necessary factor being 20.36. The determination of starch or its equivalent in reducing sugars has been looked into with care, and a preliminary extraction with alcohol and water is necessary to obtain results which are fairly constant, which determination shows black pepper to contain from 34 to 38 per cent. of starch, or 42 to 47 per cent. of substances of reducing sugar equivalent, calculated on dry ash free substance. White pepper contains in the same way from 40 to 43 per cent. starch and gives from 50 to 55 per cent. of reducing sugar equivalent on dry ash free substance. The crude fiber in black pepper does not vary far from 10 per cent., but in the white pepper is much reduced, depending to a certain extent on the perfection of the decortication. Four to 8 per cent. are probably fair limits, and this determination is quite necessary in revealing the presence of foreign woody or fibrous matter. Albuminoids do not vary widely, 10 per cent. being the average, with extremes of 7.69 and 11.50. The addition of nitrogenous seeds, of course, increases the amount, and of fibrous or woody matter diminishes it. We have the following result as a standard: