BETWEEN THE VISCOSITY OF LIQUIDS AND THEIR CHEMICAL NATURE. 527 
Taking 
7)-^ = *010950 173 = *002526 (calculated) = *005259 
ti = 0°*42 ^3 = 140°*52 (from curve) = 55°*05, 
we obtain the expression 
_ 19-644 
~ (96-352 + ’ 
which gives values in good agreement with those obtained by observation. 
Specimen I. 
Specimen II. 
V- 
Mean 
V- 
Difference. 
Difference. 
Ltililp, 
Observed 
Calcn- 
temp. 
Observed 
Calcu- 
(mean). 
lated. 
(mean). 
lated. 
0 
0-49 
-01093 
■01094 
+ -00001 
0 
0-35 
■01097 
■01096 
- -00001 
13-88 
-00881 
■00885 
+ -00004 
13-00 
■00894 
■00896 
+ -0000-2 
26-54 
-00738 
■00740 
+ -00002 
26-88 
■00735 
■00737 
+ -00002 
39-33 
-00628 
■00629 
+ -00001 
38-73 
■00632 
■00634 
+ -00002 
51-94 
-00544 
■00544 
■00000 
51-15 
■00549 
■00549 
■00000 
65-41 
-00473 
■00472 
- -00001 
65-92 
■00470 
■00469 
- -00001 
78-78 
-00416 
■00414 
- -00002 
77-48 
■00420 
■00419 
- -00001 
90-82 
-00373 
■00372 
- *00001 
90-37 
■00374 
■00373 
- -00001 
101-78 
-00340 
■00339 
- -00001 
100-71 
■00343 
■00342 
- -00001 
116-61 
-00302 
■00301 
- -00001 
115-65 
■00303 
■00303 
■00000 
128-15 
-00276 
■00276 
■00000 
128-69 
■00275 
■00275 
■00000 
141-14 
-00252 
■00252 
■00000 
139-89 
■00254 
■00254 
■00000 
ilfeto-ccyZene (Meta-dimethyl benzene). CqH^(CH 3 ) 2(1 :3). 
We are indebted to Dr. Moody for a liberal supply of this hydrocarbon. It was 
prepared from Witte’s “ pure ” meta-xylene. The hydrocarbon was sulphonated 
with ordinary sulphuric acid and the resulting sulphonic acid was recrystallised nine or 
ten times from a mixture of two parts of ordinary sulphuric acid and one part of 
water. The pure meta-acid was converted into the sodium salt which was thrice 
recrystallised. The pure sodium salt was reconverted into the hydrocarbon by 
hydrolysis with sulphuric acid and steam, dried over sodium and distilled. 
On redistillation, after standing for some time over sodium wire, the meta-xylene 
boiled between 137°*95 and 138°*10. Bar. 744*3 millims. Corrected and reduced 
b.p. = 138°*8. 
Determinations of its vapoin* density gave : 
Found I. 53*36 ; II. 52*69. 
Calculated, 53*00. 
