12 



REMARKS dN COMBUSTION. 



•—compound 



combuftibles, 



or combuftible 

 oxides, 



bafe, or com- 

 pound, having 

 more than one 

 bafe. 



Simple comb, 

 oxides. 



The compound comb ujl iblcs con fid of" compounds formed by 

 the fimple combuftibles uniting together two and two ; and 

 are of courfe much more numerous than the fimple combufti- 

 bles. They mav be arranged under the five following heads : 



1. Sulphurets, 3. Carburets, 



2. Phofphurets, 4. Alloys, 

 5. Sulphurated, phofphorated, and carbonated hidrogen. 



The combuftlble oxides are compofed of one or more fimple 

 combuftibles, combined with a dofe of oxigen. Though the 

 French chemifts have given to thefe bodies the name of oxides, 

 we fhall fee afterwards that they differ cffentially from metallic 

 and thc&h&zre oxides and from water, which is confidered at prefent as an 

 having Thngie ox ^ e of hidrogen. The combuftible oxides may be arranged 

 under two heads : 1. Thofe which contain only a tingle bafe 

 combined with oxigen, and which therefore may be termed 

 fimple combuftible oxides. 2. Thofe which contain more than 

 one bafe combined with oxigen, and which therefore may be 

 termed compound combuftible oxides. 



The fimple combuftible oxides are only four in number ; 

 namely, 



1. Oxide of fulphur, 3. Charcoal, 



2. Oxide of phofphorus, 4. Carbonic oxide gas. 

 Unlefs fulphur, phofphorus, and hidrogen gas, bodies at pre- 

 fent confidered as fimple, belong to this clafs. All the fimple 

 combuftible oxides are by combuftion converted into acids. 



The compound combuftible oxides include by far the greater 

 number of combuftible bodies; for almoft all the animal and 

 vegetable fubftances belonging to them. The double bafe is 

 ufually carbon and hidrogen : alcohol, ether, refins, gums, 

 &c. are inftances of compound combuftible oxides *. 



It was believed by Stahl and his difciples, that all combuf- 

 tible bodies contain one common principle, to which they owe 

 their combuftibility. But in confequence of the difcoveries 

 of Lavoifier this theory has been laid afide. 

 H. Supporten of II. The fupporters of combuftion are a fet of bodies which 

 are not of themfelves, ftridtly fpeaking, capable of undergo- 

 ing combuftion, but which are abfolutely neceffary for the 

 procefs ; for no combuftible body can be made to burn unlefs 



• To this clafs of bodies alfo mnft be referred all the vegetable 

 and animal acids* 



fome 



Compound 

 comb, oxides. 



Phlogifton. 



