120 HISTORICAL INTRODUCTION TO CHEMISTRY CHAP. 



calcination of the copper, nor production of inflammable 

 m (Works, II. 352-353)- 



Early quantitative experiments on the composition of 

 water. Almost simultaneously with the work of Cavendish 

 and Lavoisier, the formation of pure water as the sole pro- 

 duct of burning hydrogen and oxygen was noticed by 



FIG. 26 MONGE'S APPARATUS FOR EXPLODING 

 HYDROGEN AND OXYGEN IN AN EXHAUSTED GLOBE. 



The gases were admitted through syphon-tubes, pr, 

 PR, into the graduated measuring-cylinders, GH ; they 

 passed through the taps, IK, to the globe, M, which was 

 exhausted through a tap, L, leading to an air-pump at O. 



Monge, who carried out a series of careful quantitative 

 experiments in the year 1781 (Mem. Acad. Sci , Paris, 1783, 

 78 88). Using the apparatus shown in Fig. 26, he 

 exploded measured volumes of hydrogen and oxygen in 

 an exhausted glass globe, and thus collected a large 



