Scheerer on Isomorphism. 197 
less labor, and one which unless.entered upon in detail would 
very likely be imperfect. From all that has been said, it may 
fairly be held established, That 1 atom of magnesia, protoryd of 
iron, protoryd of manganese (probably Bie) protoxyd of co- 
balt, protoryd of nickel and oxyd of zinc. may be isomorphi- 
cally replaced by 3 atoms of water, and that 1 atom of ct of 
contrasted with that hitlerto received tt ric), hight be term- 
ed polymeric isomorphism. he is hardly a doubt but that 2 
with time, its application will be 
There occurs to. me an opposite remark of v. Bonsdorff, to the 
pri. that in hornblendes 3iAl are apparently isomorphic. with 
Si, ani opinion whith is soa tenant the eee examples of a 
smalls tae ag replacement fn ed above.* 
That polymeric is led'into play also beyond the 
region of the mineral ie m, admits scarcely of a doubt. For 
the present however, fm fine to follow the subject up be- 
ere its actual limits. 
d it almost superfluous to remark, that T am far from sup- 
tea that the eal 3 Pacer 7 ormule that I have proposed are the 
corn = Bunk ins iderable nu mber of the minerals c 
cerned, espe wih whee cm sition we are not. suff 
ciently erm nan n merely as a sugges- 
tion, and further thvaste ust seeds how far I have been 
correct in such ca 
At the conclusi jdn of ¥ thisnatticle; 1 may be perhaps perntitted to 
add a few oa which rks bye bs eS decly to me to be of some im- 
portance, and 1 Ae with the 
stibject in hand oe 6 pee oe 
> 
Among all the ced We pape ie hn n n hes been direc- 
ted, there is not a single ene’ zeolites. This 
group of minerals is distinguish forts ed of water, and is 
not the less remarkable ar the total of magnesia and 
protoryd of iron by which it is chairs, the very two bases 
which so frequently and with such facility are replaced by water. 
ues i + tees mokt taal? Securris in zeolites , are lime 
and potash, with regard to which, as far at least as minerals are 
concerned, in which they play-a leading part, it would appear 
that they are not replaceable by water. Upon endeavor to 
treat either in the whole or in part thé water contained in zeolites in zeoli 
*It is eae that the minute quantities of Al and Ot i in * Schiller- -spar (which 
see) may, upon the same principle, admit of a an quantity of Si. 
Sxconp Serizs, Vol. VI, No. 17.—Sept., 1848 
; md ‘ oo Sang ae ie - 5 eM meer ge 
b ae eee esi sae, ee es. gli tae cae pe Nae OOS ERS SOs AC GY RE Mc 
