CAPACITY OP GLASS, AND OF LIQUIDS. 
371 
Petroleum spirit. Boiling point, 159°. 
I. 
II. 
III. 
400 
133-2 
1-94 
500 
196-7 
1-91 
600 
294-7 
1-91 
Mean value of K=l - 92. 
Petroleum 
oil (Field’s). Boiling point, 310' 
I. 
II. 
III. 
350 
114-2 
2-07 
400 
141-2 
2-06 
500 
212-2 
2-07 
Mean value of K=2*07. 
Petroleum oil {common). 
I. 
II. 
III. 
400 
144-2 
2-11 
500 
214-2 
2-09 
600 
321”2 
2-09 
Mean value of K = 2T0. 
Ozokerit lubricating oil. Boiling point, 430°. 
Two determinations of this oil were made some days apart; at the time of the first 
determination the oil was slightly turbid. In the interval before determining the 
refractive index the upper portion became clear, the heavier particles having settled 
down. The capacity of the clear oil was then determined, and the results are given 
in the second table. It is possible that if the oil remain quiescent for a longer time 
a further reduction may be observed. 
First experiment. 
I. II. III. 
400 149-2 2-19 
500 223-2 2-18 
600 334-7 2-18 
Mean value of K=2T8. 
Second experiment. 
I. II. III. 
400 146-2 2-14 
500 217-7 2-12 
600 327-7 2-13 
Mean value of K=2T3. 
3 c 
MDCCCLXXXI. 
