540 
MESSRS. T. E THORPE AND J. W. RODGER OX THE RELATIONS 
Unfortunately the quantity of the substance at our disposal was insufficient to 
enable us to submit it to further dehydration. 
The observations for viscosity were as follows :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
Temp. 
Press. 
Corr. 
V- 
0 
0 
22-41 
130-67 
•000005 
•058877 
27-47 
130-93 
-OOOOOG 
■045505 
32-08 
129-21 
•000010 
•030047 
37-22 
129-32 
-000012 
•023676 
42-41 
129-26 
•000015 
•019094 
47-82 
129-27 
-000018 
•015501 
52-99 
129-25 
•000021 
•012961 
57-94 
129-24 
•000025 
•010976 
62-09 
129-25 
•000028 
•009678 
68-35 
129-67 
•000033 
•008102 j 
73-47 
129-50 
•000038 
•007058 
73-47 
129-45 
•000038 
•007057 
77-07 
129-37 
•000041 
•006448 
77-03 
129-32 
•000041 
•006447 
As the time of flow, especially at the low temj^eratures, was so considerable (at 
22°'41 it was nearly 57 minutes), only single observations were made up to 73°'47. 
In reducing the observations, the relative density d{2b°l'2b°) = 0'7886, given 
by Perkin (‘Chem. Soc. Trans.,’ 45, 469), which gives cZ(074°) = 0'8072, and the 
expression 
V = 1 + -0313126^ - -0688155^2 + •O736I2U3 
(Thorpe and Jones, loc. cit.) for the thermal expansion, have been employed. 
Two formulae are required to reproduce the values with sufficient accuracy. The 
first extends from 20° to 50°, and the second from 50° to 77°. 
They are, respectively, as follows :— 
2-05152 , TT _ 46-3090 
dt — y.gQ 3 ^^-3043 ’ ' -It — ^^3-0143 • 
The agreement between the observed and calculated values is seen in the following 
table :— 
