between the VJSCOSITr OF LIQUIDS AND THEIR CHEMICAL NATURE. 455 
Zander’s value (Annalen, 214, 165) (070°) = 0’6753 and his expression 
V = I + -0312665^ + -O^iZllS^ + - 0712315^3 
for the thermal expansion have been used in the reduction of the observations. 
Taking 
7 ^^ = -003931 173 = -002143 170 (calculated) = '002902 
Q = 0°-80 7 = 63°-59 1(2 (from curve) = ■29°-96, 
we obtain 
276-01 
~ (189-42 + 02-1264 ’ 
which gives the following values as compared with those obtained by observation : — 
Mean temp. 
'/• 
Difference. 
Observed (mean). 
Calculated. 
0 
0-80 
-003931 
•003930 
- -000001 
9-15 
-003581 
•003587 
+ -000006 
14-75 
•003378 
•003381 
+ -000003 
19-98 
•003202 
•00.3204 
-e -000002 
25'.39 
•0030.35 
•003034 
- -000001 
30-23 
•002894 
•002893 
- -000001 
36-76 
•002722 
•002719 
- -000003 
43-47 
•002557 
•002556 
- -000001 
47-42 
•002470 
•002466 
- -000004 
52-90 
•002351 
■002349 
- -000002 
58-76 
•002231 
■0022.32 
+ -000001 
63-59 
•002143 
•002143 
•000000 
Isohexane (Dimethyl-propyl-methane). (CH 3 ) 2 CH.(CH 2 ) 2 .CH 3 . 
Obtained from Professor Schorlemmer, who found its boiling-point to be 62°'0. 
Observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
Corr. 
* 
■V- 
Temp. 
Press. 
Corr. 
V- 
0 
0-48 
100-08 
•000051 
■003692 
0 
0-75 
100-02 
■000052 
•003684 
5-56 
100-09 
•000054 
•003488 
5-58 
100-00 
•000054 
■003487 
10-22 
100-02 
•000056 
■003314 
10-28 
99-99 
•000056 
•003318 
15-21 
99-98 
•Oc 00.59 
•003147 
15-31 
99-94 
000059 
•003146 
20-51 
99-92 
•000061 
•002985 
20-52 
99-91 
■000061 
•002988 
25-48 
99-95 
■000064 
•002841 
25-43 
99-87 
•000064 
•002841 
31-96 
99-99 
•000067 
•002673 
31-98 
99-91 
•000067 
•002667 
36-64 
99-96 
■000070 
•002549 
36-62 
99-92 
•000070 
•002550 
41-07 
99-96 
000072 
•002449 
41-08 
99-93 
•000072 
•002451 
45-38 
99-90 
■000074 
•002354 
45-39 
99-87 
-000074 
•002356 
51-14 
99-46 
•000077 
■002233 
51-20 
99-40 
•000077 
•002237 
55-43 
99-41 
•000079 
•002153 
55-43 
99-37 
•000079 
•002150 
