Ill 



THE BURNING OF METALS 



33 



ducing into chemistry the method of collecting gases in 

 flasks or bottles inverted over water, and of studying 



FIG. 12. 



FIG. ii. 



FIG. 13. 



FIG. 14. 



MAYOW'S APPARATUS. 



Fig. it shows a candle burning in a glass vessel inverted over water, and 



also a piece of camphor being fired by a burning-glass. 

 Fig. 12 shows the diminution of the volume of air by a mouse breathing in 



it ; a stretched bladder is sucked inwards as the air diminishes. 

 Fig. 13 shows the same experiment carried out with air contained in a glass 



vessel inverted over water. 

 Fig. 14 shows the apparatus used to collect gases prepared artificially by 



the action of acids on iron. 



changes of volume in the gas by noticing the position of 

 the water in the glass vessel. Mayow's apparatus is shown 

 in Figs, u, 12, 13 and 14 (A.C.R. XVII. Plate 5). With 



D 



