514 
DE. A. W. H0F3IAXN' OX THE PHOSPHOEES-BASES. 
comparatively little value. The faces designated as 1 1 0, 1 1 0 are in general equally deve- 
loped, but of the two others, 0 1 1 is much larger than 0 1 1, as seen in Fig. 73. 1 took 
it for granted that the two equally developed faces belonged to the zone [0 0 1], and the 
unequally developed faces to the zone [1 0 0]. 
The plane of polarization is not altered if the light passes through the faces 0 01, 
0 Ol and the faces 1 0 0, 1 0 0 in the direction [0 1 0]. 
Colour orange-red. 
The minuteness of the crystals, and the difficulty of fixing them on accormt of their 
hemihedral form, has prevented me from finding them cleavages.” 
Golden-yellow, difficultly soluble needles, which may be reciwstallized 
from boiling water without decomposition. 
I. 0‘6325 grm. of gold-salt gave 0'3285 grm. of carbonic acid and 0T788 gnn. of water. 
II. 0'6963 grm. of gold-salt left after ignition 0’3160 grm. of gold. The residue of 
gold retained Avith great pertinacity a small quantity of carbon, from which it could be 
separated only by solution in aqiia regia, filtration, and re-eA'aporation. 
The analyses lead to the formula 
C,oH,6PNAu2Cl8 = 
(C.H,)3 pt 
(C3H5)H2NJ 
Theory. 
A 
Experiment. 
. A 
f 
A 
' I. II. ‘ 
^10 
120 
13-81 
14-16 
26 
2-99 
3-14 
P 
31 
3-57 
N 
14 
1-61 
Au2 
394 
45-34 
45-38 
Clg 
284 
32-68 
869 
100-00 
Di-iodide . — It was prepared from the recrystallized platinum-salt by treatment AAith 
sulphuretted hydrogen, decomposition of the resulting dichloride by oxide of silver, 
and neutralization of the liberated base with hydriodic acid. 'White acicular crystals, 
extremely soluble in water, but not deliquescent, likewise very soluble in spirit of Avine, 
difficultly soluble in absolute alcohol, insoluble in ether. From the alcoholic liquid, the 
salt is precipitated by ether in the crystalline state. From the aqueous solution, the 
iodide separates, on addition of potassa, in the form of oily globules, AA'hich gradually 
solidify AAith crystalline structure. 
Since the examination of the phosphammonium-compoimds could not haA'e been legiti- 
mately concluded without a nitrogen-determination, the nitrogen Avas taken in this iodide. 
I. 0‘6663 grm. of di-iodide, dried in vacuo over sulphuric acid, gaA’e 0’3335 grm. of 
ammonio-chloride of platinum. 
