G92 
MESSRS. T. E. THORPE AND J. ^Y. RODGER ON THE RELATIOXS 
possessed by butyric acid at 0 °. At this value of the slope, only 5 liquids other 
thaui the alcohols could be compared, and in the following tables are given the values 
of 7) and t the temperature, for these liquids at the previous slope 'O^DS?, and the new 
slope 'OgTTQS, As before, rj is expressed in dynes per sq. centim. X 10®. 
Slope 
O 4987 . 
Slope ‘ 034798 . 
./ / t 
7 /7 • 
f. 
v'- 
t". 
It 
• 
Formic acid .. 
0 
71-7 
7.58 
0 
13 7 
2057 
2-77 
Butvric acid. 
6.5'7 
796 
0 - 
2283 
2-87 
Ethylene bromide .... 
68-8 
906 
0-9 
2397 
265 
Pi'opylene bromide .... 
65-7 
893 
- 2 -7 
2425 
2-71 
I.sobutylenc bromide 
83-3 
875 
14-7 
2400 
2-74 
Mean .... 
2-74 
Here it is again evident that the coefficients are related at slope 'OgdZOS, in 
practically the same way as at slope •0^,987, as the value of the ratio of the viscosities 
at the two slopes is practically constant and equal to 2'74. It is also significant that 
the value of the ratio calculated on the assumption that n has the mean value I 76 , 
by means of the formula 
(•0g4798/-0.i987)^’^^/'''® 
is exactly the value found above, viz,, 2‘74. 
This goes to show that at temperatures which differ so widely as those of the 
original slope '04323 and of the final slope •0g4798, the difference being about 140°, the 
viscosity coefficients are related in practically the same way, even in the case of 
liquids like the acids and the dibromides. 
With the alcohols, however, this is not the case. The following table contains the 
values of the alcohols at slopes '04987 and '0g4798. Methyl alcohol is not included in 
the tables, as the temperature corresponding with the larger slope appears to be as 
low as — 48°. 
