A text-book on chemistryFor the use of schools and colleges . antimo-ny gives an orange .pre-cipitate, arsenic a yellow,lead a brown, manganesea flesh-colored. It tarnishes silver, the metal passingthrough various shades of yellow and orange to black-ness. It is liquefied by a pressure of 17 atmospheresat 50°, the specific gravity being When cooled to— 122° it solidifies into a white substance. The action of sulphureted hydrogen is illustrated bywriting on a sheet of paper with a solution of acetateof lead. The letters are invisible until exj)osed to a cur-rent of the gas, when they becom
A text-book on chemistryFor the use of schools and colleges . antimo-ny gives an orange .pre-cipitate, arsenic a yellow,lead a brown, manganesea flesh-colored. It tarnishes silver, the metal passingthrough various shades of yellow and orange to black-ness. It is liquefied by a pressure of 17 atmospheresat 50°, the specific gravity being When cooled to— 122° it solidifies into a white substance. The action of sulphureted hydrogen is illustrated bywriting on a sheet of paper with a solution of acetateof lead. The letters are invisible until exj)osed to a cur-rent of the gas, when they become black. Sulphureted hydrogen is a natural constituent of somemineral waters, as at Sharon, in New York, and at theVirginia Sulphur Springs. It is also found in the air ofsewers and in putrefying animal matter, and has beensupposed to be the cause of miasmatic fevers. It is What is its solubility ? What arises from its combustion ? Whatprecipitates does it give with metallic oxides ? At what points doesit liquefy and solidify? Does it exist naturally?.. PHOSPHORUS. 273 very poisonous when respired, even when dilute, causingnausea, headache, and faintness. There is another compound of sulphur and hydrogen,the persulphide of hydrogen, the composition of whichis supposed to be HS5. It is a heavy yellow liquid, ofa specific gravity Selenium. #6= substance is found in certain varieties of ironpyrites. It resembles sulphur in many respects, and hasa reddish-brown color and dim metallic lustre. It tingesflame of a light blue color, and gives off an offensiveodor. With oxygen it forms three compounds: SeO, Oxide of , Selenious , Selenic Acid. With hydrogen it unites to form seleniureted hydrogen. Phosphorus. P=32. This substance, so named from shining in the dark,was discovered in 1669 by Brandt. It is now producedfrom phosphate of lime or bone-earth, but is also foundin other animal matters, more particularly in the brainand nervous tissue. The p
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