BETWEEN THE VTSCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 539 
and that it had suffered no change during the two years ; and (2) that the dimensions 
of the glischrometer had experienced no appreciable alteration during the same period, 
although it must have been washed and dried, heated and cooled, many hundreds of 
times during the interval. 
Three formulm of the Slotte type are required to reproduce the values with even 
approximate accuracy. The first extends from 0° to 38°, the second from 38° to 75°, 
the third from 75° to 105°. 
They are respectively as follows :— 
1486370-0 1112440-0 29790-3 
~ (92-248 + ~ (86-751 + + q-ot • 
The agreement between the observed and calculated values is seen in the following- 
table :— 
Mean temp. 
>h 
Difference. 
Observed (mean). 
Calculated. 
o 
0-4.5 
•079111 
-079111 
•000000 
9-90 
-055735 
-055250 
-•000485 
19-01 
-039779 
-040285 
+ -000506 
27-77 
-0-30658 
-030439 
-•000219 1 
38-16 
-022392 
-022392 
•000000 
47-44 
-017217 
-017212 
-•000005 ! 
56-48 
-013571 
-013549 
-■000022 
56-59 
-013.502 
-013511 
+ -000009 
65-95 
-010697 
•010711 
+-000014 
74-61 
-008748 
•008748 
•000000 
83-95 
-007173 
•007160 
-•000013 
93-85 
-005864 
'005868 
+-000004 
105-07 
-004753 
•004753 
•000000 
Trimethyl Cm'hinol. (CH 3 ) 3 COH. 
A sample of this substance received from Dr. Perkin, which had been distilled with 
baryta and kept in a fused state over anhydrous copper sulphate for six to seven 
weeks, was distilled. It boiled between 81°'83 and 82°’33. Bar. 756-1 millims. 
Corrected and reduced b.p. = 82°-25. 
Determinations of its vapour density showed tliat the sainjhe was pr(;bably still 
imperfectly dehydrated. 
I. II. 
Weight of liquid 
Volume of vapour 
Temperature . 
Pressure . 
0-0329 grins. 
65-77 cub. centims. 
100°-12 
166-6 millims. 
0-0572 grms. 
81-42 cub. centims. 
100°-12 
233-0 millims. 
Found, I. = 34-62 ; II. = 34-97. Calculated 37-00. 
3 z 2 
