On the Metallic Salts. 175 
ment with respect to each other, and which seem to flow from 
a law of crystallization which one would think led to the octa- 
hedral form. I think that the blackish parts are iron surcharged 
with carbon (steel), and the white parts iron. It seems pro- 
bable that the blackish portions being first consolidated have 
&s it were crystallized into the mass of iron when still liquid or 
-soft. M. Schreihers regards this arrangement as peculiar to all 
the native iron which has fallen from the atmosphere. 
I attempted to treat in a similar way a piece of native iron 
Which fell in Siberia, and described by Pallas; and in fact, small 
black and white specks became very visible; but in this speci- 
men the iron having been subjected to a high temperature which 
rendered it cellular, the black and white marks have followed 
the contours of the cavities, and are very remarkable. 
XL. Answer of H. to G.S. on the Metallie Salts. 
To Mr. Tilloch. 
Sir, — In your Magazine of January last appeared another 
paper from your correspondent G. S., who, though he apologizes 
for a small mistake committed in his first, has now strayed so 
far from propriety, that it will, perhaps, cost him more trouble 
to extricate himself, than it has to attain that state into which. 
his last has hurried him. 
You will observe a passage (page 35) with which he begins: 
** In support of H.’s assertion, that metallic salts are super-salts 
with excess of oxide—” This assertion he presses on me: but 
the evidence of some of your former numbers, in which my papers 
are inserted, cannot fail to convince your readers, that-if this is 
also a misconstruction of your correspondent’s, it must equally 
display his ignorance of the science of chemistry, and of the sub - 
stance of my former papers; or should it not be as I have re- 
presented, finding that his arguments were in some measure 
weakened by my last, he wishes to introduce this new assertion 
on my part, so that it may accord more ayreeably with his 
wishes, and enable him to bear down with redoubled violence 
ou my tortured opinion ; thus making a poor endeavour to take 
hy this stratayem that which he could not force by truth. 
Now do I consequently lay open for him to commence an at- 
tack on that opinion which J set forth, against which he may 
probably have as much to say, as against that which he has al- 
‘ready framed for me. . 
With this [ conclude, that as it is impossible for the most able 
elemist to cope with one who is regardless of that on which he 
ig : pretends 
