(g} A section of a wooden box, to hold as much mercury as will 

 cover the plates and frame, and admit the bent tube of 



(t) A small retort or vial, with a bent tube, for generating the gas 

 which passes through the hole of the plates. 



(>«) A small spirit lamp. 



(m) a tube, fixed so in the box, that the mercury, descending from 

 (d) as the gas is generated, shall overflow, and be received 

 in a cup; with which small jars njay be filled for transferring. 



VOL. X. 



