

ON FLUOR 13 



obtained first a liquid; but soon after, when the retort 

 became red hot, some fluor acid went over, and some 

 globules of quicksilver adhered to the neck of the retort. 

 The residuum was of a reddish colour. The small de- 

 composition which took place here was likewise owing to 

 the iron contained in the fluor; for, after the iron had 

 united with a part of the acid of the vitriolated mercury, 

 some quicksilver was necessarily disengaged, and rose; but 

 on increasing the heat, the vitriolated iron was again de- 

 composed, and its acid left at liberty to unite with the 

 calcareous earth of the fluor, and thus expel the acid of fluor. 



SECTION XXIV. WITH SULPHUR AND ARSENIC. 



Fluor exposed to fire in close vessels, with an equal 

 quantity of arsenic, suffered no change. The same thing 

 happened with sulphur. 



SECTION XXV. ON THE ACID OF FLUOR. 



The effects produced by fluor acid upon other bodies is 

 very remarkable. By the smell alone it is not distinguish- 

 able from the muriatic acid ; but the experiment in Sec. 

 xiv. evidently shows that these two acids are very different. 

 Besides this, the fluor could not be fixed, permanent, and of 

 a transparent and crystalline appearance, but would be 

 constantly liquid, like muriated lime. The fluor acid, in 

 some experiments, acts like muriatic acid ; in others like 

 acid of tartar; but in others it shows phenomena peculiar 

 to itself. 



