460 MESSRS. T. E. THORPE AND J. W. RODGER OH THE RELATIOHS 
In reducing the observations the value d{0°}^°)=- 0‘71883 for the density at 
0°, and the expression 
V = 1 + •0oll8304^ + -00186648^-+ -0712947^3 
for the thermal expansion (Thorpe, loc. cit.), have been employed. 
Takino- 
o 
= -007000 7^3 = -002041 7^3 (calculated) = ‘003780 
b = 0°‘25 ^3 = 122°-07 ^3 (from curve) = 51°-98, 
we obtain 
_ _ 171-82 
■“ (145-50 + ’ 
whicli gives the following calculated values :— 
i\Ieaii temp. 
Difference. 
Observed (mean). 
Calcnlated. 
0 
0-2.5 
-00700 
-00700 
-00000 
12-18 
-00594 
-00596 
+ -00002 
22 92 
-00520 
-005-22 
+ -00002 
32-96 
-00463 
-00464 
+ -00001 
43-89 
-00411 
-00411 
-00000 
54-73 
-00307 
-00367 
-00000 
66-46 
-00328 
-00327 
- -00001 
77-82 
-00296 
-00295 
- -00001 
8^-33 
-00269 
-00269 
-00000 
98-52 
-00247 
-00246 
- -00001 
109-07 
-00227 
-00226 
- -00001 
122-07 
-00204 
-00204 
-00000 
Trhnetliyl Ethylene (|8-Isoamylene). (CHg) 3 C:CH.CH 3 . 
Prepared by Dr. Perkin from the iodide olitained from dimethyl ethyl carbinol. 
On distillation, it boiled between 35°-7 and 37°‘9. Bar, 758‘7 raillims. Corrected 
and reduced b.p. = 36° 4. 
Determination of vapour density ; 
Found, 35-19. Calculated, 35-00. 
Oliservations for viscosity gave :— 
