Of Vegetation. 351 



The like plants placed in the fams man- 

 ner feparately, in the diftilled airs of Tartar 

 and Newcajlle Coal, foon faded ; yet a like 

 plant confined in three pints of air, a quart 

 of which was diftilled from an Ox's tooth, 

 grew about two inches in height, and had 

 fome green leaves on it, after fix or feven 

 weeks confinement. 



Finding that a frefti plant could not live 

 in the air, which had been for feveral months 

 infected by the mint which was placed in it 

 the 19th otjune ; inftead of a plant, I placed 

 in that air a mixture of powdered Brimftone 

 and filings of Iron moiftened with water ; this 

 mixture abforbed four cubick inches of this 

 air. 



Experiment CXXIII. 



In order to find out the manner of the 

 growth of young {hoots, I firft prepared the 

 following inftrument ; viz. I took a fmall 

 flick a> (Fig. 40.) and at a quarter of an inch 

 diftance from each other, I run the points of 

 five pins, 1, 2, 3, 4, 5, thro' the ftick, fo far 

 as to ftand-^ of an inch from the ftick ; then 

 bending down the great ends of the pins, I 

 jDOund them all faft with waxed thread ; I 

 provided alio fome red-lead mixed with oil. 

 f In 



