454] W I N position suggested by WiEfiLEB; and which raay serve as a chemical barometer. He direds 2 dranns ot camphor to be pulverized j with purified nitre, and sal ammoniac* half a dram of each. 1 hese ingre- dients are then dissolved in 2 oz. of proof-spirits, in a cyliadrical glass ; and the orifice is covered with pa- per, or a thin piece of bladder, per- forated with a needle. On placing this vessel in a nooderate ttmperz- turc, all the phenomena formerly stated, will take place according to the chancres of the weather. WHEAT.— In the 2d vol. of the " TransaSiions rf the Econo- mical Society of Florence," &c. M. Fabbhoni states, that the farmers of Tuscany divide the seeds of poise, and particularly of beans, each half of which they plant in the earth, and obtain luxuriant cw)ps. He made an experiment with some grains of corn, which w^re coarsely pounded, and thrown into a vessel of water 3 when the particles, containing germs, sank to ilie bottom. These were sown, and produced plants equal in good- ness to those raised from whole grains j many of the former even sliooting forth a greater number of stalks. WINNOW. ~ Conformably to our promise (p. 339 of this vol.), we have procured an engraving of an improved winnowing machine, mawifadtured by Messrs. T. and J. PoLFREEMAN, of Long-acrc, Lon- don J who have iurnished u^ with the following account oi its coa- strodion : J^escTiption of Messrs. T. and J. Polfbeeman's Improved Win- nowing Machine. J2g. 1 .—-A, represents a wheel WOR and strap, serving to turn the fans delineated at 1, Tig. 2. B, is a screw and plate, placed at the end of the hopper, marked 2, Fig. 2 ) the design of which is to regulate the supply of grain. C,.is a blast, the force of which may, by means of the Venetian- blind, 5, (Fig. 2) be varied, as oc- casion may require, lig. 2. — The frame marked 3, is caiCTilated for the reception of the sieves ; where the corn is separated from the chaff, and passes down the screen. — 4, is the screen, which works with the machine, and an- swers every purpose, attained by the screens commonly employed for cleaning corn, after it has been divided from the chaft'. The apparatus here described, requires the attendance of three persons, namely, one to set it in motion ; a second to f^ed, or fur- nish a supply of grain; and a third, to clear away the corn, after it is freed from impurities. With such assistance, it aa ill winnow 5 quar- ters of wheat per hour, or 6 quar- ters of barley and oats : it will like- wise clean pease, beans, and coffee ; so that it cannot fail to be peculiarly useful in the West Indies. The working of this machine is very simple ; so that, with a little practice, any person may under- stand its various parts, and the sieves proper for the corn to be winnowed. — Lastly, as different kinds of grain vary in quality, the blast should be adjusted according- ly, by means of the Venetian- blind (marked 5, in Fig. 2) ; to which a brass plate is affixed. WORMS, or Earth- woKMs. — In the 5th vol. of the " New Trans- cSiions of the Imperial Academy of Sciences at Pclershvrgh" M. So- tOLon, directs 3 parts of fresh quick-
