206 ‘ PROFESSOR LETTS AND N. COLLIE ON THE 
meter, both thermometer* and capillary tube being placed in a beaker con- 
taining sulphuric acid. 
in I... snd 00, LY, 
—_—_—_———" 
(@) PLE Gianks uncrt boda i ee ions 
(6) 212° ; : ; 212° 5 , : 210-212° 
The temperature is uncorrected. 
Double Salt with Zine Todide—This compound was formed easily with 
any of the three specimens, by adding to its alcoholic solution an alcoholic 
solution of zinc iodide, and evaporating to small bulk. The double compound 
separates in thin transparent plates of characteristic form. 
Examined under the microscope no difference could be detected in the 
crystalline form of the double salt prepared with any of the three specimens of 
the oxide. 
The salt was analysed by volumetric determinationt of iodine in specimens 
of Nos. I. and of II. and III.— 
I. 0:606 grm. required 12°4 cc. decinormal AgNO,=0'15748= 26:0 per cent, iodine. 
II. and III. 0-232 _,, - 47 ,, 3 5) = 005969259 2 5 
Calculated for {P(C;H,),0},ZnI, . : : ; : ‘ : . 26-4 
»” 
» » 
Chloroplatinate.—This salt is characteristic, and is formed with ease on 
mixing dilute alcoholic solutions of the oxide and chloride of platinum. It 
separates almost immediately as a light orange-coloured granular powder-— 
which, under the microscope, is seen to consist of groups of needles, thick, 
four-sided, and with blunt ends. Very commonly two needles form a cross, 
at other times several radiate from a common centre. No difference could be 
detected in the crystalline form of the chloroplatinate prepared with any of the 
specimens. 
The salt was analysed by determination of carbon, hydrogen, and in one 
specimen of chlorine also :— 
I, 
Chlorine. 
0:4356 grm. required 15:3 ce, decinormal AgNO,='054315 Cl=12'4 per cent. 
0-4605__,, »  26"4.c¢, »  =05822  ,, =12°6 per cent.§ 
IV. 
Carbon and Hydrogen. 
(A) 0°3932 grm. gave 0°8497 CO, = 0:25491 C = 58:9 per cent. 
03932 ,, _, 01874 BO = 002082 = 5:3 5; 
(B)-0:2738- ;,  ,, 05975 CO, = 016295 C = 594. |, 
O2788 , » 01350 0,0 = 0015" d= 76%) Is; 
* One of CasELua's. 
+ VorHarpt’s method. 
+ Hormann’s method. 
§ By precipitating the platinum with sulphuretted hydrogen and titrating the filtered solution. 
