538 
MESSES. T. E. THORPE AHD J. W. RODGER ON THE RELATIONS 
Isohiityl Alcohol. (CH3)3CH.CH20H. 
A sample received from Dr, Perkin was placed over anhydrous copper sulphate for 
a month, decanted, and distilled. It boiled between 107°'02 and 107°'42 (therm, 
567). Bar. 749'8 millims. Corrected and reduced b.p. = 107°'6. 
Vapour density : 
Found, 36*30. Calculated, 37*00. 
As the liquid is very viscous at low temperatures, the time of flow at 0°*45 being 
more than 77 minutes, only single observations were made in this series. 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
Temp. 
Press. 
Corr. 
V- 
O 
9-90 
129-65 
-000005 
-055735 
O 
0-45 
129-30 
-000004 
-079111 
27-82 
130-19 
-000009 
•030641 
38-38 
129-86 
-000013 
-022263 
47-44 
130-01 
-000016 
-017217 
56-59 
129-96 
-000021 
-013502 
65-95 
129-96 
-000025 
-010697 
74-61 
128-64 
-000031 
-008748 
The sample was redistilled nearly two years after the first series of observations, 
and a second series taken. The alcohol was now found to boil between 107°*5 and 
108°*0 (therm. 1518). Bar. 769*1 millims. Corrected and reduced b.p. = 107°*5. 
This result agrees almost exactly with that first obtained. 
The following observations were made in the glischrometer :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
Temp. 
Press. 
Corr. 
V- 
O 
O 
27-72 
129-94 
-000010 
•030675 
37-94 
130-27 
-000013 
-022522 
56-48 
129-40 
-000021 
•013571 
83-95 
129-61 
-000038 
-007173 
93-90 
129-04 
-000046 
-005854 
93 81 
128-96 
•000046 
•005874 
105-07 
128-84 
-000070 
-004751 
105-08 
128-72 
•000070 
•004755 
In reducing the observations the density and values for the relative volumes at 
different temperatures given by Pierre and Puchot (‘Ann. de Chlm. et de Phys.,’ 
(4), 22, 306) were employed. 
On plotting the two series of observations they are found to lie on exactly the 
same curve. This agreement shows (l) that the sample was uniform in character. 
