228 Scientific Intelligence. 
The compound, P,(C,H Oa Sg also dissolves in ammonia, 
and yields the chlorhydrat 
P,(C,H '0),Pt. NH, 
The methyl compounds, P(CH,O), PtCl, ee Pt 2(CH,0),PtCl,, 
yield similar compounds. It appears probable that the radical 
and P 2(Cy H,0) gPtCl,, are = Berichte der ‘Detschen 
: w. 
3. On the specific heat of carbon.—H, F. Wexner has seid 
Co—t = 0°0947+-0°000497t — 0°00000012t2. 
By means of this formula the true specific heat, or the quantity of 
heat necessary to raise the temperature of the unit of weight one 
degree at t°, may be determined, since we have: 
t:Oo— = fia 
and =0 0947-40" 000994t — = 00000036t?. 
This gives . following values for diamond: 
0° 7y=0 es 
50°. y= 071485 
100° = 01905 
150° 7 = 02357 
200° y= 02791 
In the case of graphite the author, from want Neg snow, made only 
two determinations. These gav e the equation 
Co—t = 0°1167+0-0008t 
Mt = 0°1167-+0-0016t 
These results explain the discrepancies in the iinet . 
the specific heats of carbon by other physicists. They sh w tha 
oar amond at about 525°C. would have a specific heat of 052 ee 
as as the law.of Dulong and Petit requires. Weber considers 
