504 
DE. A. W. HOFMAXX ON THE PHOSPHOEUS-BASES. 
The crystals are generally tabular, as in the above figures ; sometimes, however, they 
are elongated in the direction [0 0 1], and then the faces are most unequally developed. 
Figs, 60 and 61, and, again. Figs. 62 and 63 exhibit two very remarkable crystals of this 
kind. 
The faces of the form 211 are generally very unequally developed, and some are 
actually wanting. In the crystals Figs. 60 and 61, and, again. Figs. 62 and 63, only two 
out of the eight faces 211 were well developed. The six others were wanting, or could 
but just be traced. 
The lustre of the faces 0 0 1 is glassy, or even peaily. The lustre of the other faces 
is less marked, and more fatty. 
Cleavages 0 01 easily obtained and rather perfect ; 1 1 0 easily obtained, but fibrous. 
The axes of optical elasticity, in the order of magnitude, are [0 0 1], [1 0 0], [0 1 0]." 
Compounds of Oxethyl-trimethtlphosphonium. 
The liquid filtered from the sulphide of platinum in the three analyses of the 
platinum-salt of bromethyl-trimethylphosphonium above given, yielded by evaporation 
the extremely soluble and deliquescent chloride. This salt has not been analysed ; but 
I have transformed it, by oxide of silver, into the corresponding oxethylated com- 
pound, 
The caustic liquid is converted by hydrochloric acid into the easily soluble chloride 
corresponding to the hydrate ; this chloride, treated with dichloride of platinum, yields 
the platinum-salt of oxethylated trimethylphosphonium, which crystallizes in octohedra. 
like the corresponding ethyl-compound, but is distinguished from the latter by its extra- 
ordinary solubility in water. 
The composition of this salt was fixed by a platmum-determination. 
0'3383 grm. of platinum-salt, precipitated udth hydrosulphuric acid, Szc., gave OTOlO 
grin, of platinum. 
The formula 
Cj H„ P O Pt Clj = [(C, Hj O) (C H3)3 P] Cl, Pt a, 
requires the following values : — 
