260 



Dr. E. Frankland on a New Series of 



Inorganic Types. 

 Zn O . . 



Zn 



Organo-metallic Derivatives. 

 Zn (C«H8^) Zincmethylium. 



Q > Oxide of Zincmethylium. 



SbS 



Sb 



SbS 



C^RS Utib^thine. 



C-* H^ >Binoxide of Stibsethine. 



J 



^ Oxide of Stibsethylium. 



Sn 

 Sn- 



C^Rs 

 C4R5 

 O ->' 



. Sn (C^RS) Stansethylium. 



Sn ^ Q t Oxide of Stansethylium. 



TT rC^R^l Iodide of Rydrargyro- 

 ° L I J methylium. 



The only compound which does not harmonize with this 

 view is ethostibylic acid, to which Lowig assigns the formula 

 C'* R* SbO* ; but as that chemist has not yet fully investigated 

 this compound, it is possible that further research may satisfac- 

 torily elucidate its apparently anomalous composition. 



It is obvious that the establishment of this view of the con- 

 stitution 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, Rofmann and 

 Paul Thenard ; indeed, the close analogy existing between stib- 

 sethine and ammonia, first suggested by Gerhardt, has been most 

 satisfactorily demonstrated by the behaviour of stibsethine with 

 the haloid compounds of methyle and sethyle. Stibsethine fur- 

 nishes us, therefore, with a remarkable example of the operation 

 of the law of symmetrical combination above alluded to, and 

 shows that the formation of a five-atom group from one contain- 

 ing three atoms can be eflfected by the assimilation of two atoms, 

 either of the same or of opposite electro-chemical character : 

 this remarkable circumstance suggests the following question : — 

 Is this behaviour common also to the corresponding compounds 

 of arsenic, phosphorus and nitrogen ; and can the position of 

 each of the five atoms, with which these elements respectively 



