BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 453 
for the thermal expansion (Thorpe and L. M. Jones, ‘ Chem. Soc. Trans.,’ 1893, 
p. 273), were used in the reduction of the observations. 
Taking 
7^^ = *002805 '>73 = '002070 r/g (calculated) = '002410 
= 0°‘74 ‘ % = 32°*66 (from curve) = 16°*00, 
we obtain 
19-459 
~ (165-59 + Qi-7295 ’ 
which gives results in very close agreement with the observed values. 
Mean temp. 
'?■ 
Difference, 
Observed (mean). 
Calculated. 
o 
0-74 
"002805 
■002805 
■000000 
7-47 
■002620 
■002619 
-•000001 
13-16 
■002481 
■002476 
-■000005 
18-91 
■002.351 
■002344 
-■000007 
26-30 
■002192 
■002191 
-•000001 
30-41 
■002110 
■002111 
+ •000001 
32-66 
■002070 
■002070 
•000000 
Isoimilane (Dimethyl-Ethyl-Methaiie). (CH 3 ) 3 CH.CH 3 .CH 3 . 
Obtained from Professor Schorlemmer. On distillation from sodium wire it boiled 
between 29° and 32°. Bar. 763*4 millims. Corrected and reduced b.p. = 30°-4. 
Dr. Perkin, who examined the magnetic rotation of the same sample, found tlie 
same boiling-point. 
The observations for viscosity gave :— 
Left limb. 
Rig 
lit limb. 
Temp. 
Pres.?. 
Corr. 
Temp. 
Press. 
Corr. 
'/• 
o 
! 0-69 
100-05 
■000066 
•002704 
o 
0-73 
100-01 
•000066 
•002702 
6-41 
100-02 
•000069 
"1)02546 
6-40 
99-95 
•0000)-.9 
■002549 
11-89 
100-01 
•000072 
■0024u7 
11-94 
99-95 
■000072 
■0U2408 
15'80 
100-00 
■000074 
•002323 
15-85 
99-95 
■OU0074 
•002321 
i 21-05 
99-99 
■000077 
•002209 
20 91 
99-95 
•000077 
-002-215 [ 
24-20 
99-96 
■000079 
•002143 
24-34 
99-89 
■000079 
•002145 ! 
26-33 
99-98 
•000080 
■002101 
26-44 
99-90 
•000080 
•002103 1 
In reducing the observations, Perkin’s value for the relative density, 
(/(15°/15°) = 0-62479, 
