between the viscosity of liquids and their chemical nature, 511 
Mean temp. 
Difference. 
Observed (mean). 
Calculated. 
0 
30-86 
-01025 
-01025 
-00000 
39-88 
-00903 
-00905 
+ -00002 
48-47 
-00806 
-00808 
+ -00002 
67-46 
-00721 
-00723 
+ -00002 
68-10 
-00638 
-006.38 
-00000 
76-66 
-00580 
-00580 
-00000 
84-53 
-00534 
-00534 
-00000 
93-97 
-00484 
-00486 
+ -00002 
102-89 
-00445 
-00445 
-00000 
112-.57 
-00406 
-00406 
-00000 
Propionic Acid. CH 3 .CH 0 .COOH. 
A sample of the pure acid received from Dr. Perkin was distilled, and the portion 
boiling between 140°'52 and 140°‘65^was collected separately, n = 10°‘5, t ■= 32°’5 
(emergent column). Bar. 758'1 millims. Corrected and reduced b.p. = 140°‘76. 
The observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
>]■ 
Temp. 
Press. 
Corr. 
V- 
0 
4-54 
128-66 
-000026 
-014076 
0 
4-86 
1-28-62 
-000026 
•014008 
16-83 
128-61 
-000031 
-011504 
16-91 
128-52 
-000031 
■011508 
28-19 
128-87 
-000036 
-009790 
28-23 
128-80 
-000036 
•009785 
40-04 
128-96 
-000041 
-008387 
40-05 
128-85 
-000041 
•008399 
52-04 
128-71 
-000047 
-007280 
52-02 
128-57 
-000047 
•007297 
63-60 
128-81 
-000052 
-006423 
63-67 
128-69 
-000052 
•006423 
76-.35 
1-28-87 
-000058 
-005644 
77-05 
128-77 
-000058 
•005604 
88-94 
128-88 
-000066 
-004989 
90-19 
128-79 
-000066 
•004939 
101-04 
128-49 
-000071 
-004478 
100-99 
128-39 
-000071 
•004481 
112-98 
128-43 
-000077 
-004034 
112-98 
128-32 
-000077 
•004033 
112-37 
128-32 
-000077 
•004049 
123-63 
128-37 
-000083 
-003676 
123-71 
128-30 
-000083 
•003679 
137-02 
128-42 
-000091 
-003297 
137-09 
128-45 
•000091 
•003294 
100-47 
128-52 
-000071 
-004508 
100-08 
128-58 
•000071 
•004521 
113-04 
128-46 
-000078 
-004026 
11.3-07 
128-41 
•000078 
•004027 
125-33 
128-37 
-000084 
-003633 
125-41 
128-33 
•000084 
•003623 
135-90 
128-26 
-000090 
-003322 
136-28 
128-21 
•000090 
•003321 
After the observations were finished it was discovered that a minute quantity of 
the mercury of the thermometer had distilled up into the vacuous space. It was 
considered desirable, therefore, to repeat such of the observations as might possibly 
