(3 PLAN OF THE WORK. 



Neither is there any thing in the earlier parts of the course that 

 renders it necessary to exhibit the deflagrations, ignition,* and mus- 

 cular shocks produced by this agent ; and which, when presented at 

 the conclusion, with the aid of powerful apparatus, terminate a 

 long course of demonstrations and reasoning, with the most brilliant 

 finish that can be desired. 



So far as the natural history of bodies, and their analysis, and ap- 

 plications to use are proper subjects of attention in a concise Manual, 

 I have thought it better, in general, to give the facts, in connexion 

 with the different articles to which they belong, rather than at the end 

 of the work. 



The numerical tables that are not given in the body of the work, 

 are of course contained in an appendix. They are necessarily se- 

 lected from different authors, and although little used by the student 

 of mere elements, are important for occasional reference. 



* Dr. Hare however uses a small calorimotor to explode gases ; and his larger in- 

 struments exhibit results, more splendid and interesting, than any other Galvanic 

 apparatus with which I am acquainted. 



