578 
MESSRS. T. E. THORPE AND J. W. RODGER ON THE RELATIONS 
Constants in Slotte’s Formula, -q — C/(l + ^0“ (continued). 
C. 
5. 
n. 
Methyl alcohol. 
•008083 
•006100 
2-6793 
Ethyl alcohol. 
•017753 
•004770 
4-3731 
Pz’ojjyl alcohol. 
•038610 
•007366 
3-9185 
Butyl alcohol— 
0° to 52° . 
•051986 
•007194 
4-2452 
52° to 114°. 
•056959 
•010869 
3-2150 
I.sopropyl alcohol— 
0° to 40°. 
•045588 
•007057 
4-9635 
40° to 78°. 
•048651 
•011593 
3-4079 
Isobntyl alcohol— 
0° to 38°. 
•080547 
•010840 
3-6978 
38° to 75°. 
•085365 
•011527 
3-6708 
75° to 105°. 
•094725 
•015838 
3-0537 
Inactive amyl alcohol— 
0° to 40°. 
•085358 
•008488 
4-3249 
40° to 80°. 
•093782 
•0125-20 
3-3395 
80° to 128°. 
•152470 
•026540 
2-4618 
Active amyl alcohol— 
0° to 35°. 
•111716 
•009851 
4-3736 
35° to 73°. 
•124788 
•015463 
3-2542 
73° to 124° . 
•147676 
•127583 
2-0050 
Trimethyl cavbinol— 
20° to 50°. 
•135060 
T2S156 
1-3242 
50° to 77°. 
1-755458 
•196967 
2-0143 
Dimethyl ethyl carhinol— 
0° to 27° . 
•142538 
-020868 
3-2080 
27° to 63°. 
•154021 
•027019 
2-7578 
63° to 95°. 
•131901 
•026082 
2-6610 
Allyl alcohol. 
•021736 
•009139 
2-7925 
Nitrogen peroxide. 
•005267 
•007098 
1-7349 ; 
(3.) The main cause of the want of regularity in the values of b and n is, no doubt, 
due to the fact that they are interdependent, and, as has been stated, that different 
pairs of values of these constants give practically tlie same curve. Moreover, from 
the mode of deducing their values, they are, in many cases, largely affected by 
influences which are within the limits of experimental error. On referring to p. 440 
it will be seen that the denominator of the expression which serves to determine n is 
(h + h) — 2^. In the case of curves which approach the linear type this denominator 
is but small, it may be but several tenths of a degree ; and, hence, since an error of 
one-twenty-fifth of a degree in reading off from the curve corresponds to one-tenth 
of a degree in the value of the denominator, in extreme cases the value of n may be 
altered by one-half by errors incidental to plotting and reading the curves employed. 
Thus, in the case of aldehyde, the denominator is 0°'3, and here an error of 0°'l in 
