between the viscosity of liquids and THElll CHEMICAL NATUBE. 5L5 
quence of a minute quantity of the mercury of the thermometer having distilled into 
the vacuous space (comp. p. 511). In the second series the thermometer was 
inverted and replaced in position just before the observation of temperature and 
How. The second set of observations lie exactly on the curve which expresses the 
first series ; no sensible error in the determination of the temperature had tlierefore 
been made. 
In reducing the observations we have employed for the thermal expansion the 
mean values obtained from the concordant results of Pierbe and Puchot (‘ Aniiales 
de Chim. et de Phys./ (4) 28, 3G6), and of Zander (‘Annalen,’ 224, 91). 
For the relative density we have adopted d (o7o°) = 0'9G70, the mean of the 
closely agreeing values given by Pierre and PucnoT, Linnemann, Bruhl, and 
Markownikoff. 
Taking 
rj^ = -017605 7^3 — -003234 (calculated) = -007545 
= 3°-69 ^3 = 147°-47 7 (from curve) 60°-G2, 
we obtain the formula 
212-41 
“ (104-63 + ’ 
which gives the following calculated values :— 
Mean temp. 
'/• 
Differeuce. 
Observed (mean). 
Calculated. 
o 
3.69 
-01761 
•OlV'el 
•00000 
17-00 
-01383 
•01386 
+ -00003 
29-33 
-01137 
■U1L50 
+ -00013 
42-53 
-00945 
•00952 
+ -00007 
54-54 
-00811 
•00814 
+ -00003 
70 49 
-00674 
•00672 
- 00002 
88-06 
-00560 
-00544 
- -00016 
98-94 
-00199 
•00497 
- -00002 
109-78 
-00450 
-00448 
- -00002 
120-97 
-00407 
•00101 
- -00003 
134-50 
•00361 
•00310 
- 00001 
147-47 
•00323 
-00323 
•00000 
96-46 
•00512 
•00509 
- -00003 
107-62 
•00460 
•00457 
- -00003 
122-33 
•00402 
•00399 
— 00003 
135-42 
•00359 
•00357 
- -00002 
