ACETATE OF ALUl^INE PRECIPITATED BY HEAT. 33 



capacity for saturation of these bases, prevents tbenn from 

 forming quadroxalates. 



The conclusions, that may be drawn from the observa- 

 tions I have here submitted to the judgment of the class, 

 are : 



1st, That the soluble oxalates alone are capable of taking General con- 

 up an excess of acid, and forming salts less soluble than the cUisions. 

 neutral salts: 



^d, That the property of forming superoxalates depends 

 on the force of cohesion of the acid, combined with that of 

 the alkali*. 



3d, That potash is th,e only alkali capable of forming a 

 quadroxrtlate. 



4th, That, in all the superoxalates, the alkali is pon- 

 stantly combined with twice as much acid as in the corre- 

 sponding neutral oxalate. 



VII. 



Observations on Acetate of Alumine : bi/ 3Tr, Gay- 

 LussAcf. 



Jl^ Long ago remarked, that, when a solution of acetate of Heat precipi- 



atumine is heated, it soon grows turbid, and lets fall a large t^tes acetate of 



. °, , . . " alumine, 



quantity of alumine. In this there is nothing strange, and which is 



it is easily explained : but, if the acetate be allowed to cool, redissoived by 



- . , cooling. 



we shall see the precipitate gradually dissolve, and the 



liquid resume its transparency. If the saline solution be 

 heated a second time, it will become turbid anew, and again 

 transparent on cooling. I have repeated these operations 

 twenty times following, and the results have been con- 

 stantly the same. 



Acetate of alumine made with cold saturated solutions of Experiments 

 alum and acetate of lead, and consequently but little con- to show this. 

 centrated, became turbid at 50* cent. [122* Fahr.]. It 



. • By force of cohssion I me^n. the tendency to form insoluble com- 

 pounds» 



t Ann. de Chit^^ vol. LXXIV, p. 193. 

 Vol.. XXXL^iJAN. 1812. D being 



