Fixed Air on Vegetation. 361 



for feveral minutes, and a crinrifon polyanthos 

 was introduced into the middle part, and fuf- 

 pended by a ftring. In pafTing through the 

 mouth of the veflel, the petals we neceflariiy 

 comprefied, and one or two received fome da- 

 mage. The effervefcence was kept up brifkly. 



On the fame day, and into the fame veflel 

 a young fprig of mint, with its root, was in- 

 troduced, and a fimilar fprig was placed in a 

 large glafs decanter as a ftandard. The edges 

 of the former were much nipped by fome fevere 

 winds which had prevailed, and had a yellowifh 

 hue. 



The polyanthos did not begin to droop till 

 the 15th. On the i6ch it was taken out fhri- 

 velled, but the colour not changed. 



The mint examined on the 12th v/as more 

 frefli than when firft put into the veffel with 

 fixed air. The next day two young flioots ap- 

 peared more vigorous. On the 15th its appear- 

 ance v/as more vivid than that in common air, 

 but the next day it was apparently dead, and was 

 taken out in a flaccid ftate. * 



April 26th, A polyanthos plant, with its root 

 and flovyers, was purchafed in the market, with 



• The machine having no valve, and having been vio- 

 lently fhaken, I fufpeded that feme of the vitriolic acid 

 had been forced up the tubes ; for the moifture, in the in- 

 fide of the vcfTel, was more acid than it would have been 

 from the fixed air only. 



feveral 



