442 
DR. E. FRANKLAND ON A NEW SERIES OF 
Inorganic Types. 
o 
Zn 
O, 
Organo-metallic Derivatives. 
Zn| I Oxide of Zincmethylium. 
C4H5'| 
Sb<( C4 Hg Istibethine. 
c.hJ 
Sb< 
■C^Hg- 
C4Hg 
C4 Hg J^Binoxide of Stibethine. 
O 
o . 
C4H5 
C4Hg 
Sb<^ C4 Hg |>Oxide of Stibethylium. 
C4Hg 
O . 
Sn^ 
Hg 
ro 
o 
Sn (C4Hg) Stanethylium. 
r c H 1 
Sn^ ^ VOxide of Stanethylium. 
Hg| 
rc H 
^ ^ ^ Iodide of Hydrargyrometbylium. 
The only compound which does not harmonize with this view is ethostibylic acid, 
to which Lowig assigns the formula C4 Hg Sb Og ; but as that chemist has not yet 
fully investigated this compound, it is possible that further research may satis- 
factorily elucidate its apparently anomalous composition. 
It is obvious that the establishment of this view of the constitution of the organo- 
metallic bodies will remove them from the class of organic radicals, and place them 
in the most intimate relation with ammonia and the bases of Wurtz, Hofmann and 
Paul Thenard ; indeed, the close analogy existing between stibethine and ammonia, 
first suggested by Gerhardt, has been most satisfactorily demonstrated by the 
behaviour of stibethine with the haloid compounds of methyl and ethyl. Stibethine 
furnishes us, therefore, with a remarkable example of the operation of the law ot 
symmetrical combination above alluded to, and shows, that the formation of a five- 
atom group from one containing three atoms, can be effected by the assimilation of 
two atoms, either of the same, or of opposite electro-chemical character: this re- 
markable circumstance suggests the following question : — Is this behaviour common 
also to the corresponding compounds of arsenic, phosphorus and nitrogen ; and can 
