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 . e elements, has beenfound as a constituent of tea, tobacco, milk,blood, and in almost all spring waters. Fur-thermore, the prodigiously sensitive reactionsafforded by the spectroscope have not onlyrevealed the presence of infinitesimal quantitiesof known elemen
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 . e elements, has beenfound as a constituent of tea, tobacco, milk,blood, and in almost all spring waters. Fur-thermore, the prodigiously sensitive reactionsafforded by the spectroscope have not onlyrevealed the presence of infinitesimal quantitiesof known elements, but have led to the dis-covery of new ones which had escaped detec-tion by the older and less delicate processes ofanalysis. It was by means of spectrumanalysis that the two alkali metals, caesiumand rubidium, were discovered by Bunsen andKirchkoffin 1860 in a mineral water at Durk-heim, and that Mr Crookes in 1861 discoveredthe metal thallium in the deposit found in theflue of a pyrites furnace; whilst still morerecently Messrs Eeich and Richter, in a spec-trum examination of a zinc ore from Freiberg,discovered the metal indium. The most brilliant spectra are given bythose salts which are the most easily volati-lised, such as the chlorides, iodide?, and bro- ANALYSIS 145 JTrt^licro J37ue^ GiecTt yeTToW Orajige JlerZ. l4o AXALTSIS nud^ of the different metals. Bnt it is only i3ae metals of tke alkalies and alkaline eartiistibat give spectra that are cLaracteristic. Whenit is desired to ottaln the spectra of the othermetals, they may he raised to the requisitetemperatnTe by means of the electric spark,whi^ in passing through the two points of-lie metal operated npon volatilises a minntequantity of it, asd thus enables it to emit itsparticular lights Tl» electric sparks arebest obtained by means of Enhmkoras ^ich metal may be made to yield aspeetnim which specially belongs to it, and toit alone. When the electric discharge is sentthrough a compound gas or v
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