CHEMICAL PARADOXES. 



ends bent in to support the rim of the inner 

 tube, leaving spaces for the free egress of com- 

 bustion gases from the flame of a Bunsen burner 



or spirit lamp applied at 

 B. If the apparatus be 

 held over such a flame, 

 in a very short time 

 moisture like dew will be 

 deposited outside the 

 inner tube. The droplets 

 will quickly enlarge and 

 grow together into larger 

 drops, which will run 

 down the tube and fall 

 off at B, either into the 

 flame, which they will 

 spoil, or into any receiver 

 over which the tube may 

 be shaken in order to 

 collect the water. 



This arrangement, or 

 some other on similar 

 principles, is only re- 

 quired to collect the drops 

 of water quickly, cer- 

 tainly, and in consider- 

 able quantity ; but other 



arrangements will illustrate the principle as 

 certainly, if not quite so freely. The inner 

 tube may be a piece of lead pipe beaten over 

 at one end, or a large glass test-tube. 



FIG. 43.-BARYTA MADE RED- 

 HOT BY POURING COLD 

 WATER OVER IT. 



202 



