264- New Apparatus for the 



be surprised, that a variety of products should be the results of 

 the agency of galvanism, in the animal body, of which the 

 component parts are so numerous and so differently circum- 

 stanced ? 



Art. IV. Description of a New Apparatus for the Com- 

 bustion of the Diamond. 



Ix the course of the experiments which Sir Humphry Davy 

 made at Florence on the combustion of the diamond, he dis- 

 covered that when the genr began to burn in an atmosphere of 

 pure oxygen, having free access to it on all sides, it would 

 continue burning, though the original source of heat were 

 removed, until the particles were rendered so small as to be 

 too readily cooled by the little platinum tray which supported 

 them. {Philosophical Transactions, 1814, p. 557.) In conse- 

 quence of this observation, an idea arose, that if the diamond 

 were well heated, and then introduced into oxygen, it would 

 go on burning, and afiford an easy method of exhibiting its 

 combustibility. Upon trial this was found to be the case, and 

 a notice to that effect put in this Journal. (Vol. iv. p. 155). 

 Since then, an apparatus of this kind has been perfected, and 

 is now represented in Plate 3, Fig. 1. 



It consists of a glass globe, of the capacity of about 140 

 cubical inches, furnished with a cap, having a large aperture ; 

 the stop-cock, which screws into this cap, has a jet. A, rising 

 from it, nearly into the centre of the globe, this is destined to 

 convey a small stream of hydrogen, or other inflammable gas. 

 Two wires, c. c, terminate at a very little distance from each 

 other, just above this jet, and are intended to light the stream 

 of hydrogen by electrical sparks ; one of them commences 

 from the side of the jet, the other is inclosed and insulated 

 nearly in its whole length in a glass tube : the tube and wire 

 pass through the upper part of the stop-cock, and the wire 

 terminates on the outside in a ball or ring, D, at which sparks 

 are to be taken from the machine, either directly or by a chain. 

 On the end of the jet is fixed, by a little socket, a small 



