BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 459 
which ffives numbers in fair agreement with the results of observation : — 
Mean temp. 
Diti’ereucc. 
Observed (mean). 
Calcnlated. 
0 
0-42 
-004743 
-004743 
■000000 
7-70 
-004343 
-004355 
+ -000012 
15-88 
-003959 
•003972 
+ -000013 
24-63 
-003607 
-003615 
+ -000008 
32-31 
-008333 
-003338 
+ -000005 
40-05 
-003092 
-003090 
- -000002 
49-01 
-002839 
-002835 
- -000004 
56-46 
-002651 
-002646 
- -000005 
63-92 
■002484 
-002474 
- 000010 
71-84 
■002316 
-002309 
- -000007 
80-66 
-002149 
•002144 
- -000005 
88-41 
-002012 
•002012 
•000000 
Octane. CH 3 .(CH 3 )o.CH 3 . 
A sample of normal octane, prepared by Professor Schorlemmer from capryl alcohol, 
was digested over phosphoric anhydride and distilled from sodium wire, and the fraction 
boiling between 124°'57 and 124°‘73, which was more than half the total amount, was 
collected separately and used for the observations. Bar. 747‘8 millims. Corrected 
and reduced b.p. = 125''-24. 
Determination of vapour density : 
Found, 56’54. Calculated, 57’00. 
The observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
V- 
Temp. 
Press. 
Corr. 
V- 
o 
0-23 
104-48 
•000030 
•007001 
o 
0-28 
104-39 
•000030 
•006999 
12-18 
104-52 
•000035 
•005944 
12-19 
104-44 
•000035 
•005944 
22-92 
104-58 
•000040 
•005198 i 
22-92 
104-53 
•000040 
•005200 
32-97 
104-64 
•000044 
•004623 ' 
32-96 
104-56 
•000044 
•004630 
43-89 
104-73 
•000049 
•004108 
43-90 
104 64 
•000049 
•004107 
54-72 
104-89 
•000054 
•003673 
54-74 
104-82 
•000054 
•003675 
66-47 
104-99 
•000059 
•003282 
66-46 
104-90 
•000059 
•003289 
77-83 
104-99 
•000065 
•002957 
77-82 
104-92 
•000065 
•0029(;l 
88-33 
103-76 
•000069 
•002694 
88-34 
103-69 
•000069 
•002697 
98-52 
103-74 
•000074 
•002473 
98-52 
103-69 
•000074 
•002474 
109-03 
103-70 
•000079 
•002270 
109-11 
103-71 
■000079 
•002272 
122-08 
103-82 
•000086 
•002039 
122-07 
103-75 
•000086 
•002043 
3 N 2 
