346 On SpQJita7ico7is JnJIainmations. 



vcak lev of carbonate of soda and boiled linseed oil in the 

 proportion of an eighth, a twelfth, and a sixteenth. It 

 therefore remains; to ascertain whether this cotton will sooner 

 eatch tire than that impregnited with a mixture of the alka- 

 line solution of alumine and boiled linseed oil in the same 

 proportions. As the latter mixture is susceptible of attract- 

 ing a little of the moisture of the air, 1 am inclined to think 

 that cotton treated with the first will inflame sooner. The 

 trials which 1 continue to make in regard to the use of gall 

 nuts in dyeing Adrianople red, induce me to believe that it is 

 bv the formation of a gallate of alumine that alumine is fixed 

 upon cotton, that the gallic acid may be afterwards sepa- 

 rated by an alkaline carbonate before the process of dyeing 

 is be2;un. When I have acquired certain information on 

 this subject, I shall nut fail to publish the result. 



LXI. On Spontaneous Ivflainmat'w;i<!. By C- BAnrnoLDi, 

 Professor of Natural Plnlosophy and Chemistry*. 



-L HE name of spontaneous inflammation is given to that 

 manifested lu a combustible body, without its being in im- 

 mediate contact vi ith a body in a state of inflammation. 



Combustion of this kind may be occasioned by ditferent 

 causes, the principal of which are : 



1st, Violent friction. 



2d, Action of thc sun. 



3d, The disengagement of the caloric produced in bodies 

 though not combustible, but brought near to combustible 

 bodies, to which thcv may communicate such a degree of 

 heat that thev inflame by the contact of the air. 



4lh, The fern>cntation of animal and vegetable sub- 

 stances heaped up in a large mass, which are. neither too 

 dry nor too moist, as hav, dung, 8cc. 



5th, The accumulation of Wool, cotton, and other ani- 

 mal and vegetable substances, covered with an oilv matter, 

 aiid particularly a drying oil. 



6th, The boiling of linseed oil for printers ink, of var- 

 nish, and in general of every fat matter. 



7th, The torrefaction of diflcrent vegctaljlc substances. 



8th, Sulphurized and phosphorized hydrogen gas disen- 

 gaged in several operations of nature, the last of which in 

 particular inilamcs merely by the contact of the atmospheric 



* Fic.Ti the Annales de Comif, No- 144.. 



air 



