To face page 26. 



FIG. it. Water-Absorbers. At the right is a complete Absorber with rubber elbows and connections. At the 

 left is represented the interior of an Absorber, showing the method for breaking up air-bubbles as the air 

 passes through the acid, the device for preventing the escape of acid through outgoing air-pipe, and the 

 opening by means of/which the Absorber is filled and emptied. 



FIG. 12. A Carbon-Dioxide Absorber showing Cylinder Cap, Collars, Wire-gauze Disks, and Cakes of 



spent Soda Lime. 



