BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 543 
Vapour density :— 
Found, I. 42’17 ; IT. 42’31. Calculated, 44’00. 
The observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
V- 
Temp. 
Press. 
Corr. 
V- 
O 
o 
0-39 
129-76 
•000004 
•086402 
11-40 
129-96 
•000005 
•058225 
23-70 
129-34 
•000008 
-039222 
34-67 
129-44 
•000010 
-028-239 
45-90 
129-44 
•000014 
•020719 
57-72 
129-63 
•000019 
•015303 
69-70 
129-48 
•000025 
•011582 
81-69 
129-75 
•000031 
•008925 
92-17 
129-87 
•000038 
•007240 
102-97 
130-22 
•000046 
•005942 
115-53 
130-30 
•000056 
•004804 
125-64 
130-30 
•000064 
-004107 
125-68 
130-24 
•000064 
•004101 
On account of the length, of time of flow (about 84 minutes at 0°'39) only single 
observations were made except at about 125°, when duplicate readings were taken in 
both limbs. In reducing the observations we have used the value cZ(0°/4°) = ’8254 
for the density, and the expression 
V = 1 + -0392410^ + -06264281^2 + -0713486^3 
for the thermal expansion (Thorpe and Jones, loc. cit.). 
The second sample of inactive amyl alcohol was prepared for us by Mr. Greeves 
in the laboratory of the Royal College of Science, by Pasteur’s method. When 
examined in the Soleil-Duboscq Polarimeter with a sodium flame, not the least indi¬ 
cation of rotation was apparent. 
It was carefully dehydrated by copper sulphate and distilled, when it was found to 
boil almost constantly between 131°'50 and 131°-55. P>ar. 762'0 millims. Corr. and 
red. b.p. = 131°'44. 
Vapour density : 
Found, 44'18. Calculated, 44'00. 
The observations for viscosity gave :— 
