276 
Transactions of the Royal Society of South Africa. 
In addition the monocyclic phthaleins may be calculated, using the 
C0 2 H factor of Part XIII : the results are the same as in Part XIII and 
agree with observation. Other unobserved but calculated substances are :: 
PhCH . CH . C 6 H 4 0' (calc. A 356), Ph . X . N . C 6 H 4 0' (calc. A 447), 
V \/ 
Ph 2 X . CHOH . C 6 H 4 0' (calc. A 375), and Ph 2 C : CH . C 6 H 4 0' (calc. A 339 
double). Almost all the possible substances have thus been considered. 
Note. — The bands of the acid solutions of the oxyazo and oxyazomethine 
dyes are calculated * by multiplying the above-calculated (alkaline phase) 
bands by the factor 143, and the bands of the neutral phase by multiplying 
by a factor which is about 0-8. All the six bands of each substance are thus 
calculated. 
Monocyclic Amino-compounds. 
The calculation of these is simply made from the oxy-compounds by 
, NH 3 A 
multiplying by the factor 148 for acid solutions, the factor for 
OK 
NH 2 . 
For neutral solutions the factor is about 1-05. 
Table of Calculated Amino-compounds (Acid). 
Name. 
Calculated X. 
Observed k. 
p-toluidine salt 
. 264x1-18 = 312 
£>-aminobenzaldehyde 
377 
Agrees visually. 
p-aminobenzophenone 
427 
Probably exceptional. 
Amino benzylalcohol . 
342 
j See Part XIII. 
Aminobenzhydrol 
388 
Fuchsonium salts 
440 
430. 
Aminotriphenylmethane 
401 
p-phenylenediamine . 
370 
Quinone-diimine 
405 
About 370 (ether). 
Aminodiphenylamine 
420 
Quinone- phenyl diimine 
460 
488 and 450. 
p-nitrosoaniline 
448 
410 vague. 
Aniline yellow A 
512 
520. 
B 
480 
485. 
Aminobenzalaniline A 
430 
About 440. 
B 
405 
About 415. 
Benzalphenylenediamine A 
480 
"^465 broad, probably 
B 
453 
J double. 
?}-aminostilbene A 
381 
B 
405 
Amino-azoxybenzene 
527 
* See the Table at the end for the observations. 
