PROOF SPIRIT • FREE TRANSLATOR.ORG • Definition of Proof spirit

... Moschcowitz has found that the tensile strength of catgut so prepared is increased if it is kept dry in a sterile vessel, instead of being left indefinitely in the iodine solution. If Salkindsohn's formula is used—tincture of iodine, 1 part; proof spirit, 15 parts—the gut can be kept permanently in the solution without becoming brittle. To avoid contamination from the hands, catgut should be removed from the bottle with aseptic forceps and passed direct to the surgeon. Any portion unused should be ...

— Manual of Surgery - Volume First: General Surgery. Sixth Edition. • Alexis Thomson and Alexander Miles

... easy and economical way of obtaining, and preserving the flavour of lemon-peel, is to fill a wide-mouthed pint bottle half full of brandy, or proof spirit; and when you use a lemon, pare the rind off very thin, and put it into the brandy, &c.: in a fortnight it will impregnate the spirit with ...

— The Cook's Oracle; and Housekeeper's Manual • William Kitchiner