BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 519 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
'/• 
Temp. 
Press. 
Corr. 
o 
6-74 
128-48 
-000094 
-002664 
o 
6-64 
128-43 
•000094 
-002671 
6-89 
128-37 
•000094 
-002660 
9-49 
128-43 
-000096 
-002590 
9-46 
128-.38 
•000096 
•002599 
11-81 
128-29 
-000097 
-002534 
11-81 
128 24 
•000097 
•002530 
14-24 
128-28 
-000099 
-002472 
14-19 
1-28-20 
•000099 
•002478 
17-16 
128-70 
-000101 
-002409 1 
17-09 
128-66 
•000101 
•002411 
19-61 
128-52 
-000103 
-002350 
19-59 
128-.54 
•000103 
•002352 
21-81 
128-47 
-000104 
-002314 
21-84 
128-41 
•000104 
<002.310 
24-.34 
128-43 
-000106 
-002255 
24-36 
128-37 
•000106 
•002254 
2.5-46 
128-33 
-000107 
-002233 
25-44 
128.36 
•000107 
-002233 
27-24 
128-29 
-000108 
-002201 
27-21 
128-27 
•000108 
•002202 
29-04 
128-24 
-000109 
-002165 
28-91 
128-20 
•000109 
•002165 
30-24 
128-18 
-000110 
-002140 
.30-21 
128-16 
•000110 
•002138 
.32-04 
128-28 
•000112 
•002096 
In reducing the observations we have employed Kopp’s value d{0°/0°) = 0‘73058 
for the relative density, and his expression 
V = 1 + 0-03l4802G^ + 0-05350316^2 _|_ o-o^27007t^ 
for the thermal expansion (‘ Pogg. Ann.,’ 72, 1 and 223). 
We are indebted for the second sample of ether to Dr. PepjvIN. After standin 
for a night over sodium wire it was distilled ; it boiled completely between 34°- 
and 35°-8. Bar. 768-0 millims. Corrected and reduced b.p. = 35°-0. 
The slight difference in the boiling point of the two samples may be due to super¬ 
heating. It is noteworthy that Tamman (Wied. ‘ Ann.,’ 32, 683) and Beckmann 
(‘Zeits. f. physik. Chemie,’ 4, 536), independently, found very great difficulty 
in obtaining ether of a constant vapour pressure. 
A determination of the vapour density of Dr. Peekin’s sample gave 36-88., 
Calculated, 37'00. 
The observations for viscosity gave :— 
00 aq 
