536 MESSRS. T. E. THORPE AND J. W. RODGER OH THE RELATIOXS 
The observations have been reduced by means of Zander’s values for the relative 
density at 0°, 0‘7996, and his expression for the thermal expansion, 
V = 1 + •0210534;’ + -004430^2 + '0-2.7274:1^ 
(‘Annalen,’ 214, 154). 
Two formulm are required to reproduce the values with sufficient accuracy. The 
first extends from 0° to 40°, the second from 40° to 78°. 
They are respectively as follows : 
2175320000-0 192398-0 
■ ~ (141-72 + 0^-9635 ’ ■ Vt— (86-259 + ‘ 
The agreement between the observed and calculated values is seen in the following 
table :— 
Mean temp. 
V- 
Difference. 
Observed (mean). 
Calculated. 
O 
0-36 
-045018 
■045018 
•000000 
7-21 
-035568 
■035635 
+ -000067 
14-41 
-028167 
■028191 
+ -000034 
22-22 
•022204 
•022126 
- -000078 
30-5.5 
-017275 
•017301 
+ -000026 
37-92 
-014053 
•014053 
•000000 
45-15 
-011604 
•011589 
- 000015 
51-97 
-009770 
•009753 
- -000017 
59-39 
-008157 
•008161 
+ -000004 
66-60 
-006923 
•006938 
+ -000015 
72-02 
-006141 
•006147 
+ -000006 
78-09 
-005407 
•005407 
•000000 
Butyl Alcohol CH3 .(CHo)2 .CH20H. 
A quantity of the alcohol obtained from Kahlbaum was dehydrated by caustic 
baryta. It boiled between 117°'25 and 117°'90. Bar. 7G4‘6 millims. Corrected and 
reduced b.p. = 117°’42. 
Vapour density : 
Found, L, 36-02 ; II., 36-13. Calculated, 37-00. 
As the alcohol is rather viscous at low temperatures, the time of flow at 0°-27 
being nearly 50 minutes, single observations only were made up to 83°. The results 
are as follows :— 
