Barium, StrojitiuTn, and Calcium. 



297 



was placed, including a glass flask, of which the stem extended 

 vertically through the neck of F. From a vessel V, with a cock 

 intervening, a tube luted to the orifice of the flask extended to 

 the bottom of it, so as to convey thither from Y a current of ice- 

 water, which, after refrigerating the bulk of the flask, could es- 

 cape through the nozzle projecting, horizontally, from the neck, 

 T. The mercury in the capsule D communicates through the 

 rod with the negative poles of one or more deflagrators. The 

 capsule L in like manner wiih the corresponding positive poles. 



Fig. 1. 



A rod of platina reaches from some mercury in the capsule D, 

 through the necks of the beds A and B, into a stratum of mercury, 

 resting upon shoulder of the bell glass B, so as to be about a quar- 

 ter of an inch beneath the flask. Several circumvolutions of 

 platina wire, No. 14, forming a flat coil, were interposed between 

 the mercury and the bottom of the flask. The recurved ends of 



