REPORT ON CHEMISTRY. 
425 
The conclusion to which all analyses pointed was, that the atom 
of certain classes of acids, of certain classes of bases, and of 
certain classes of elementary substances, possessed each the 
same ultimate form, and might therefore be substituted for, or 
made to replace each other without altering the form of the 
crystalline compound, into which they entered as constituent 
parts # . Such suites of bodies constitute the isomorphous 
groups already referred to. 
Isomorphous Groups. —The following list of isomorphous 
bodies is as perfect as my means of information permitted ; and 
I have endeavoured to arrange the groups in such a way as to 
show the links by which they are already known to be con¬ 
nected with each other. 
List of Isomorphous Bodies , arranged in their several Groups . 
Chlorine 
I. 
Cl 
IV. 
Sulphur . 
S 
Iodine. 
I 
Selenium.. 
Se 
Bromine .... 
. Br 
Chromium . . . .. 
Cr 
Fluorine . . . . 
F 
Manganese. 
Mn 
Manganese . . 
. Mn 
V. 
II. 
• • 
Protoxide of Manganese. . . . 
Mn 
Chloric Acid 
. Cl 
• • 
Protoxide of Iron . 
Fe 
Iodic Acid . . 
> 
• • • 
I 
• • 
Oxide of Zinc.. . 
Z’n 
Bromic Acid 
• • • 
. . Br 
—-— Nickel. 
Ni 
III. 
—-— Cobalt . 
Co 
Hyperchloric Acid .. 
• • • • 
. . Cl 
Peroxide of Copper . .. 
Cu 
Hypermanganic Acid .... 
• • • • 
. . Mn 
Magnesia. 
Mg 
* The analytical researches, which, next to the important labours of Mit- 
scherlich, have contributed most to the establishing of this important conclu¬ 
sion, are : 
1°. Rose’s Analysis of the Pyroxenes: K. V. Acad. Handlingar, 1820. 
o 
2°. Bonsdorf’s Analysis of the Amphiboles: Berzelius, Arsberattelse, 1821. 
3°. Wachmeister’s Analysis of the Garnets: K. V. Acad. Handlingar, 1823. 
4°. Kohler on Diallage : Poggendorff's Annalen, vol. xiii. p. 111. 
5°. Kobell on Talc: Kastner’s Archiv, vol. xii. p. 29, on which, however, so 
much confidence is not to be placed.—And more recently an elegant Memoir of 
6°. Abich on Spincll and other Minerals occurring in the form of Octo- 
haedrons. 
