J. H. Long—Indices of Refraction of Compound Ethers. 281 
Pri ROPYL PROPIONATE, ETHYL ISOBUTYRATE. 
Bp = 101°5-102°  P, 384mm ‘ Bp = 107°-107°°3 
Nl. 
23 1391 25 1:38 
2 1°39253 00054 24 1°38589 00052 
21 1°393 23 1°38 
20 1:39356 51 22 138693 52 
19 1°39405 49 21 1°38745 52 
18 139452 44 20 1°38797 52 
17 1°39497 45 
ISOBUTYL PROPIONATE. PROPYL ISOBUTYRATE. 
Bp = 135°°2-135°°5 Bp = 130°°5-131° 
T. n. n. 
20 1°397 25 13 
19 1:397938 00045 24 1°39414 00045 
18 1°398 45 23 13 
17 1:39882 44 22 139504 45 
16 1°39925 43 21 1°39549 45 
20 1°39593 44 
19 1°39637 44 
MYL PROPIONATE. ISOBUTYL ISOBUTYRATE 
Bp = 159°*5-160° Bp = 144°-145 
T. n diff, T. 
23 1:405 25 1397 
22 1:40567 00044 24 139819 00044 
21 1:406 23 1°3986 44 
20 1:40653 43 22 1°39906 43 
19 1:40696 43 21 139949 43 
18 140738 42 20 2 43 
17 1:40780 42 19 140034 42 
ISOBUTYL BUTYRATE, AMYL ISOBUTYRATE 
# Bp = 154°5-155° Bp = 166° “166°5 
n, diff, po 
20 1:40443 25 1:4054 
19 1°40485 00042 24 0591 00043 
18 140527 2 23 1°4063 
7 140570 43 22 42 
16 1:40612 42 21 140718 4 
15 1:40654 42 20 1:40759 41 
. 19 1:40800 41 
18 1:40841 ya. 
4 AMYL BUTYRATE. PROPYL VALERATE. 
: Bp = 178°-178°5 Bp = 155°°5-156° 
y: 22 n diff. y 
1:41010 24 14018 
21 1°41052 00042 23 1°40229 00047 
20 1°410 22 14 
19 141135 1 21 1°40321 46 
18 141176 41 20 1°40366 45 
MW 141217 41 19 ~—«2140411 45 
18 1°40455 44 
Merny. ISOBUTYRATE. ISOBUTYL VALERATE. 
. Bp = 89°-8-90° Bp = 169°-169°°4 
, 1 
26 1°38082 a 35 14 
25 138136 00054 24 1°40441 -00048 
- 138190 23 1 
: 1°38243 53 22 6 7 
2 1°38296 53 21 1:40583 47 
21138348 52 2 1°4063 47 
1:38399 51 
