Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . Mag. 260 diams. Most of the brown sugars of commerce are in-fested by this pest, which is of a size suffi-ciently large to be visible to the naked following method of proceeding will leadto its detection: Dissolve 2 or 3 teaspoonfuls of sugar in alarge
Cooley's cyclopaedia of practical receipts and collateral information in the arts, manufactures, professions, and trades including medicine, pharmacy, hygiene, and domestic economy : designed as a comprehensive supplement to the Pharmacopoeia and general book of reference for the manufacturer, tradesman, amateur, and heads of families . Mag. 260 diams. Most of the brown sugars of commerce are in-fested by this pest, which is of a size suffi-ciently large to be visible to the naked following method of proceeding will leadto its detection: Dissolve 2 or 3 teaspoonfuls of sugar in alarge wineglass of tepid water, and let thesolution remain for an hour or so, at the ex-piration of which time the acari may befound, some on the surface of the liquid, some attaching themselves to the sides of the glass,and some at the bottom, mixed up with thecopious and dark sediment, made up of frag-ments of cane, woody fibre, grit, dirt, andstarch granules, which usually subside on dis-solving even a small quantity of sugar in hotwater. When first hatched this acarus ishardly visible. Acari of all sizes—that is, in all stages ofgrowth—may be met with in most samples ofsugar. Dr Hassall, in seventy-two samples of sugarwhich he examined, found sixty-nine contain-ing them. Acarus Siro, the cheese-mite (fig. c). The dry Fia. and powdery parts of decayed cheese, which bycareful watching may very frequently be seenin movement, consist almost wholly of thisinsect and their eggs in different stages of de-velopment. The cheese-mite can hardly beseen without the aid of the microscope. Theyare very tenacious of life, even when keptwithout food. Mr Blyth says that underthese circumstances it is no uncommon sightto see them killing and devouring each other;and that cheese is rapidly destroyed by them ;they crumble it into minute pieces, and emit aliquid substance which causes the decayedparts to spread speedily. They may be de-stroyed by being exposed to a strong heat, orby putting t
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