470 
MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
Isolutyl Iodide. (CH 3 ) 3 CH.CH 2 l. 
About 500 cub. centims. of isobutyl iodide, boiling between 119° and 121° were 
fractionated. The greater portion boiled between 120° and 120°'5. This was shaken 
with mercury, to remove any free iodine, decanted, and treated with phosphoric oxide, 
and the portion boiling at 119°‘75 and 119°’95 collected separately. Bar. 7G2’0 milliins. 
Corrected and reduced b.p. = 119°'94. 
The iodide was re-distilled under diminished pressure before being introduced into 
the glischrometer. The portion collected came over, without actual boiling, between 
57° and 71° under a pressure of from 85 to 141 millims. 
The observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
>!■ 
Temp. 
Press. 
Corr. 
1 
>h i 
1 
o 
0-45 
100-22 
•000040 
•011534 
O 
0-45 
100-08 
•000040 
•011544 , 
11-23 
100-66 
■000047 
•009784 ; 
22-46 
100-59 
•000054 
•008430 
22-43 
100-48 
•000054 
•008441 ' 
33-84 
100-56 
•000061 
007385 
44-54 
100-58 
•000067 
•006578 
44-59 
100-42 
•000067 
•006577 
54-68 
100-52 
•000074 
•005933 
54-63 
100-36 
•000073 
•005938 i 
65-17 
100-53 
•000080 
•005364 
65-06 
100-36 
000080 
•005371 
77-31 
100-56 
•000088 
•004801 
77-35 
100-40 
•000088 
•004805 1 
86-92 
100-55 
•000095 
•004416 
86-74 
100-37 
•000094 
•004427 
97-84 
100-61 
•000102 
•004032 
109-20 
100-57 
•000109 
•003683 
109-20 
100-46 
•000109 
•003687 
116-04 
100-54 
•000114 
•003493 
116-09 
100-39 
•000114 
•003486 
The liquid at the outset was perfectly colourless, but in the course of the work it 
gradually became yellow and ultimately dark red at the higher temperatures. It 
remained, however, transparent to the end. 
In reducing the observations, we employed the value cZ (0°/0°) = 1'6345 for the 
relative density, and the numbers given by Pierre and Puchot (‘ Ann. de Chim. et 
de Phys.,’ 4, 22, 318) as expressing the thermal expansion. 
Taking 
= •011539 
7^3 = -003489 
rjo, (calculated) = •006345 
h = 0°A6 
^3 = 116°-05 
to (from ciu.we) = 47°-95, 
we obtain 
27-652 
~ (108-86 + 
577 
which gives the following calculated values :— 
