ON THE PHOSPHOEUS- BASES. 
597 
The analysis of this platinum-salt concludes the experimental part of our inquiry ; for 
clearness and comparison we subjoin the following synopsis of the compounds which we 
have investigated. 
a. MeTHYL-SeEIES. 
Trimethylphosphine Meg P. 
Platino-chloride of trimethylphosphine . . . Meg P, HCl, PtClg. 
Binoxide of trimethylphosphine Meg POg. 
Bisulphide of trimethylphosphine Meg PSg. 
Biselenide of trimethylphosphine Meg PSeg. 
Iodide of tetramethylphosphonium Me4 PI. 
Platino-chloride of tetramethylphosphonium . . Me4 PCI, PtClg. 
Auro-chloride of tetramethylphosphonium . . Me4 PCI, AuClg. 
Iodide of trimethylethylphosphonium .... (Mcg E) PI. 
Platino-chloride of trimethylethylphosphonium . (Mog E) PCI, PtClg. 
Iodide of trimethylamylphosphonium .... (Mog Ayl) PI. 
Platino-chloride of trimethylamylphosphonium . (Mcg Ayl) PCI, PtClg. 
/3. Ethtl-Seeies. 
Triethylphosphine Eg P. 
Platino-chloride of triethylphosphine .... Eg PCI, PtClg. 
Binoxide of triethylphosphine Eg POg. 
Bisulphide of triethylphosphine Eg PSg. 
Biselenide of triethylphosphine Eg PSeg. 
Iodide of tetrethylphosphonium E4 PI. 
Platino-chloride of tetrethylphosphonium . . . E4 PCI, PtClg. 
Auro-chloride of tetrethylphosphonium . . . E4 PCI, AuClg. 
Iodide of methyltriethylphosphonium .... (MeEg) PI. 
Platino-chloride of methyltriethylphosphonium . (MeEg) PCI, PtClg. 
Iodide of triethylamylphosphonium Eg) PI. 
Platino-chloride of triethylamylphosphonium . . (Ayl Eg) PCI, PtClg. 
On glancing once more over the phosphorus-compounds described in the preceding 
memoir, a comparison of these substances with the corresponding terms of the nitrogen-, 
arsenic-, and antimony-series is unavoidably forced upon us. Whether we consider the 
composition, or whether we review the properties of these groups, the most striking 
analogies, indeed an almost perfect parallelism, cannot be mistaken ; the same formulse, 
the same mode of combination, the same decompositions. 
This analogy is particularly manifest in the compounds belonging to the ammonium- 
type. In these remarkable bodies, nitrogen, phosphorus, arsenic, and antimony appear 
to play absolutely the same part. It is more especially in the oxides of these compound 
metals that analogy of composition induces a perfect identity in properties, and, indeed, 
of very salient properties, which may be traced in almost every direction. If we were 
MDCXXJLVII. 4 I 
