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Test Papers (Chemistry are PAPERS)

in chemistry, are PAPERS, in chemistry, are alcoholic solution of a vegetable coloring matter which changes color when exposed to the action of an acid or alkaline solution. The paper, after being gently dried, is cut into slips of a suitable size.

Hence, by dipping the appropriate test tain whether it is acid, alkaline, or neupapers into any solutio any solution, one can ascertral. Litmus and turmeric are most commonly used as the coloring matters; litmus for the detection of acids, and turmeric for that of alkalies. Test papers retted hydrogen, etc., and for such a are also employed for detecting sulphusolution of an appropriate substance. purpose the paper must be dipped in the Thus acetate of lead paper becomes black in presence of sulphuretted hydrogen, while starch paper becomes blue when touched with iodine.

TESTUDINARIA (so named from the resemblance which the great, rugged, cracked root of the plant bears to the phant's foot or Hottentot's bread; a geshell of a tortoise), in botany, the elebut with the seeds winged only at the nus of Dioscoreacex, akin to Dioscorea, nus of Dioscoreaceæ, akin to Dioscorea , tip, instead of all round. Rootstock above ground sometimes four feet in diameter.

Stems occasionally 40 feet long; flowers small, greenish-yellow. T. elephantipes tentot's bread. The rootstock is a large, is the common elephant's foot or fleshy mass, covered with a thick bark, Hottentots in time of scarcity made use cracked deeply in every direction. The of yam. of the fleshy inside of the root as a kind