OXIDATION* OF IROtf. g(^ 



ifierate the many economical and philosophical uses to f 

 which the stove may be applied. It is sufficient for the pre- < 

 sent purpose, if I have rendered the principle and plan in- 

 telligible, the artist and manufacturer will then be at no loss " 

 in adapting- it to the particular object, which he may require 

 to accomplish* 



A certificate from Mr. S. Sellers, Chemist, Broad street, 

 Bloomsbury, stated, that the effects of the stove in question 

 Are as Mr. Field has described them in his paper. 



IV. 



inquiries concerning the Oxidations of Iron; by Mr. Darso. 



(Continued from page 226. J 



Oxides by Solution. 



T, 



HE solutions of iron afforded me still more satisfactory Solutions of 

 results, both because they confirm and render more clear non - 

 those obtained by calcination, and because they may throw- 

 much light on a number of manufactories, and simplify the 

 chemical theory of iron. But, convinced as I am of these 

 results, I offer them only as conjectures,. since they are dia- 

 metrically opposite to the present mode in which solutions 

 of iron are viewed, and I am always afraid of being led into 

 errour. 



The inconstancy of the green oxide, which Lavoisier and Green oxide 

 Mr. Proust obtained when 100 grains of iron had taken up vanable - 

 37 of oxigen ; and which, from the experiments I have re- 

 lated, varies from a few hundredths to 32 ; could not but lead 

 me to conclude, that the properties distinguishing this oxide 

 from the red, are owing not to a fixed degree of oxigenation, Why? 

 . but rather to a certain density, which allows the water, or the 

 , acid, of both, to lodge in the interstices of each molecule; 

 and hence the difference of colours of these precipitates by 

 alkalis, prussiates, and gallates, and their less or greater so- 

 lubility; the only properties that distinguish the green salts 

 from the red. 



T 2 This 



