BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 5 l / 
Mean temp. 
Difference. 
Observed (meau). 
Calculated. 
O 
0-18 
-01238 
-01238 
•00000 
12-52 
-01007 
-01012 
+ -00005 
24I0 
-008-52 
-00856 
+ -00004 
1 So'-iO 
-00734 
-00735 
+ -00001 
i 48-15 
-00630 
-00630 
-00000 
60-39 
-00551 
-00550 
- -00001 
71-04 
-00494 
•00492 
- -00002 
84-42 
-00434 
-00433 
- -00001 
■ 95-09 
-00394 
-00393 
- -00001 
108-92 
-00351 
•00350 
- -00001 
120-23 
-00320 
-00319 
- -00001 
13.3-39 
-00289 
•00289 
-00000 
Proinonic Anhydride. (CH3.CHg.C0)20. 
A quantity of this liquid, obtained from Kahlbaum, was shaken with a small 
quantity of phosphoric oxide for a few minutes, decanted and submitted to fractional 
distillation. The portion employed for the observations boiled between 168°’30 and 
169°‘25. Bar. 765’1 millims. Corrected and reduced b.p. = 168°'56. 
The observations for viscosity gave :— 
Left limb. 
Right limb. 
Temp. 
Press. 
COIT. 
Temp. 
Press. 
Corr. 
a 
0-45 
132-85 
-000024 
•015918 
O 
0-49 
132-75 
•000025 
0159-23 
14-71 
132-92 
-000032 
•012187 
14-69 
132-82 
•000031 
-012-207 
•29-98 
132-87 
-000039 
•009559 
-29-96 
132-80 
•000039 
•009581 
44-83 
132-83 
•000047 
•007790 
44-89 
132-72 
•000047 
•007797 
59-48 
132-78 
•000056 
•006509 
59-56 
132-70 
•000056 
•006509 
74-92 
132-38 
•000065 
•005492 
74-82 
132-29 
•000064 
•005497 
94-88 
132-38 
•000077 
•004498 
94-86 
132-29 
•000076 
•004507 
104-50 
133-11 
•000083 
•004119 
104-55 
133-05 
•000083 
•004124 
119-54 
133-02 
•000092 
•003603 
119-60 
132-94 
-000092 
•003613 
134-59 
132-91 
•000102 
•003187 
134-71 
132-84 
•000102 
•003194 
148-66 
132-91 
-000111 
•002864 
148-66 
132-82 
•000111 
•002869 
164-56 
132-71 
•000121 
•002545 
In reducing the observations we have employed the 
the density, and the expression 
value c/(0°/4°) = 1'0336 for 
V = 1 + 0•02l09109^ + 0-0(.38295^2 + Q-OgGSHGU^ 
for the thermal expansion (Thorpe and L. M. Jones, loc. cit.). 
