7^^ SILEX SUBLIMED IN IRON WORKS. 



Analogies be- Admitting this proportion, these substances would corre- 

 tween the am- gponj with regard to the rank they hold an:iona: animal 



mal and vege- ' " . ® 



table king- substances, to the rank occupied by sugar, gum, woody 

 ^^^- fibre, &c. , among vegetable substances: for, as hidrogen 



and oxigen, the gaseous principles of these, are capable of 

 mutually saturating each other, and forming water ; hidro- 

 gen, oxigen, and nitrogen, the gaseous principles of those, 

 can also mutually saturate each other, and form water and 

 ammonia: so that carbon, the only fixed principle they all 

 contain, has no property that acts in this saturation. If we 

 allow ourselves to be guided by analogy, in this point of 

 view, we should compare the animal acids with the vegetable 

 «cids ; and the animal fats, if there be any that contain 

 nitrogen, with vegetable oils and resins; consequently there 

 is not a sufficient quantity of hidrogen in the uric acid to 

 saturate the oxigen and nitrogen this acid contains, or to 

 form water and ammonia by combining with these two 

 substances ; and in animal fats the contrary must occur. 

 Tlhe subjert to ^^ doubt many more consequences may be drawn from 

 be pursued, the preceding results : but we reserve for a future paper 

 this^ inquires of the extent and importance of which we are 

 fully aware. 



XI. 



Chemical Examination of a white, filamentous Substance, 

 found in the Cavities of the Cast Iron that adheres to thts 

 Sides of high Furnaces: by Mr, Vauqubiin^. 



In 



Piercs of iron JLN smelting iron ores there are frequently portions of me- 

 thes'.d"sof *^^' ^^^^'^j beginning to assume the character of iron, and 

 the furnisce, congealing the moment before the iron is drawn off, remaia 

 and containing adhering to the sides of the furnace. In these pieces cavi- 

 st^ice^*" ties gre frequently formed, which are filled with a white fila- 

 mentous substance, like flexible amianthus. 

 supposed to be Several metallurgists have spoken of this substance. 

 o:iide of zinc. (jj,.ig,jon in particular hasconsidered it as an oxide of zinc v. 



* Ann. de Chim vol. XXVII, p. 19^. Extracted from tke Ann. des 



Museum (.rHist, Nat. An. 7. 



but 



