SEMO

39.3

improper where the seed capsule is liable to decay, or moulder.Seeds abounding in volatile oil, such as anise, caraway, and carda-moms, will keep good for years; those which have much fixed oil,as nuts, almonds, and castor-seeds, soon become rancid; those whichabound in fecula, or mucilage, often become the prey of insects, ordecay by exposure to moisture.

Seidlitz Powders. Take 5ij of tartarized soda, and 3ij of carbonateof soda; mix, and dissolve in half a pint of soft water. Then dis-solve gr. xxxv of tartaric acid in q. s. of water, and add this to theformer solution. It must be drank in a state of effervescence. It isa mild cooling purgative ; but is not at all like the genuine SeidlitzWater.

Seidlitz Water. Aqua Sedlicensis. P. Take ^xxss of water, acidu-lated in the usual apparatus, with thrice its volume of carbonic acidgas, about 51) of sulphate of magnesia, gr. xviij of muriate of mag-nesia, dissolve, and bottle for use. If it be wanted stronger, doublethe quantity of the sulphate and muriate of magnesia.Medicinally it is purgative and deobstruent.

Seleniates are salts formed by selenic acid.

Selenic Acid is procured by treating seleniate of soda with nitrate oflead, washing the precipitate, and exposing it to a stream of sulphu-retted hydrogen. It is very similar to sulphuric acid.

Selenious Acid is procured by digesting selenium in nitric acid till itis completely dissolved, and evaporating the solution to dryness.

Selnnites are salts formed by selenious acid.

Sklenium is a brittle, opaque, solid body, without taste or odour, buthas the metallic aspect of lead.Insoluble in water, but combines readily with oxygen when heated.Test. When exposed to the blowpipe it tinges the flame light blue,and diffuses a strong odour of decayed horse-radish.

SeleniurettedHydrogen, the same as hydroselenic acid gas.

Seltzer Water. Aqua Selterana. P. Take gxxss of water impreg-nated by the usual apparatus with carbonic acid gas, and dissolve init gr. iv of subcarbonate of soda, gr. ij of subcarbonate of magnesia,and gr. xx of muriate of soda. It is a mild purgative.

Selway's Prepared Essence of Senna. •* This," says Dr. Paris," is a concentrated infusion of senna in combination with an alkali."The Doctor, in his last edition, has expunged his recommendation ofhis friend's nostrum, which in his fifth edition was so very in-consistent with his attack on Mr. Battley about the liquor opiisedativus.

Semina. See Seeds.

Semolina. A preparation of flour, made by moistening it and forming