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Partxviii
FOURTEEN USEFUL RULES FOR LIQUOR MERCHANTS, SHOWING HOW TO RE- DUCE OR RAISE THE STRENGTH OF SPIRITS BY THE ADDITION OF STRONGER SPIRITS OR WATER, ACCORDING TO TRALLE'S AND GENDAR'S HYDRO METERS, HOW TO ASCERTAIN THE COST OF ANY QUANTITY OF ALCOHOL AT ANY DEGREE ABOVE OR BELOW PROOF, HOW TO ASCERTAIN THE QUANTITY OF PURE OR ABSOLUTE ALCOHOL IN ANY GIVEN AMOUNT OF