In a pure apple cider vinegar hydrogen sulphide gas will not cause any discoloration, nor will the addition of a solution of either barium nitrate, silver nitrate, or ammonium oxalate cause anything more than the _very slightest_ perceptible turbidity. But the addition of some solution of lead acetate--that is, of sugar of lead--will cause an immediate voluminous and flocculent precipitation, which will all settle out in about ten minutes, leaving a clear fluid above. In most of the so-called “apple vinegars,” made with second pressings of the fermenting pumice, the addition of some of this lead solution will cause but a slight turbidity, without any precipitate settling out for several hours, and even then the precipitate will not be of the same appearance as in apple cider vinegar. Sophistications of cider vinegar that will not be detected by some one or more of the above given tests are not likely to be met with, for the simple reason that they are not profitable. To translate percentages of acid strength into the old commercial terms of grains of soda bicarbonate per troy ounce, the per cent. may be multiplied by 6·72, or, _vice versâ_, divide the grains by the same factor. To reduce it into grains of potash bicarbonate 8 would be the factor to be used in like manner. The general Adulteration of Food Law of the State of New Jersey is the same as that of New York. The following is a copy of a special Act in relation to the sale of adulterated milk:-- AN ACT to prevent the adulteration of milk and to regulate the sale of milk. [Sidenote: Persons selling or offering for sale skimmed milk, to solder a label or tag upon can or package.] [Sidenote: Penalty for violating this section.] 1. Be it enacted by the Senate and General Assembly of the State of New Jersey, that every person who shall sell, or who shall offer or expose for sale, or who shall transport or carry, or who shall have in possession with intent to sell, or offer for sale, any milk from which the cream, or any part thereof has been removed, shall distinctly, durably and permanently solder a label, tag or mark of metal in a conspicuous place upon the outside and not more than six inches from the top of every can, vessel or package containing such milk, and said metal label, tag or mark shall have the words “skimmed milk” stamped, engraved or indented thereon in letters not less than one inch in height, and such milk shall only be sold or shipped in or retailed out of a can, vessel or package so marked, and every person who shall violate the provisions of this section shall be deemed guilty of a misdemeanour, and on conviction thereof shall be subject to the penalties prescribed in section eight of this Act. [Sidenote: Penalty for selling or offering for sale impure or adulterated milk.]