.; 



g 



Anahfis of the Air. 287 



acquired rednefs of the Minium, indicating 

 the addition of plenty of fulphur in the o- 

 pcration : For fulphur, as it is found to act 

 nioft vigoroully on light , fo it is apt to 

 reflect the ftrongeft, viz. the red rays; and 

 that there is good (tore of air added to the 

 Minium , I found by diftilling firft 1922, 

 rains of Lead, from whence I obtained 

 only feven cubick inches of air - y but from 

 1922 grains, which was a cubick inch of 

 Red Lead, there arofe in the like fpace of 

 time 34- cubick inches of air; a great part 

 of which air was doubtlefs abforbed by the 

 fulphureous particles of the fuel, in the 

 reverbcratory furnace, in which the Mi- 

 nium was made; for by Experiment 106. 

 the more the fumes of a fire are confined, 

 the greater quantity of elaftick air they ab. 



forb. 



It was therefore doubtlefs this quantity 

 of air in the Minium which burft the her- 

 metically fealed glafles of the excellent Mr., 

 Boyle, when he heated the Minium con- 

 tained in them by a burning glafs ; but 

 the pious and learned Dr. Nieuwentyt at- 

 tributes this effect wholly to the expan- 

 sion of the nre particles lodged in the Mi» 

 5 niuni, 



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