Colour and Chemical Constitution. 
161 
too much for me, particularly as regards substitution in the h and * 
positions. 
The following table contains my observations (note : A fluorescein 
= 4931) :- 
Substitution- products of Fluorescein. 
a-monobromo- 
a-d-dibromo- 
c-monobromo- 
a-c-dibromo- 
a-c-d-tribromo- 
a-6-c-d-tetrabromo- 
a-methoxy- . 
b- or c-methoxy- 
a-6-c-trichloro- 
a-b-c- d-tetrachloro 
y-j-dibromo- 
/-g-j-tribromo 
/-a- i ?-&-tetrabromo- 
(eosine) 
o-J-dimethyl- 
(cresorcin 
/-A>dibromo-a-J-dimethyl 
A-i-dimethyl 
cin) ^ 
••>} 
(" y-orcinphthalein ' 
f~~9 J-^-tetrabromo-, der. of above 
X 
501 
509 
499 
506 
511* 
514 
497 
492 
505 
513 
509 
515 
521 
500 
516 
489| 
521 
A-i-dioxy- (phloroglucin- 
phthalein) 
A-i-dimethyl-abcd-tetrachloro- 
a-c -dichloro -f gj k-tetrabrom o- 
b-c- „ 
(Phloxin M) 
J 489 neutral 
\494 alkali 
} 
511! 
538 
529 
abcd-tetrachloro-fgjk-tetrabromo 
(Phloxin proper) j 
abcd-tetrachloro-fgjk-tetraiodo- "\ 
(Pvose bengale) J 
[" a-orcinphthalein " 
Oxyquinolphthalein 
548 
. 520 vague] 
550+527+509 
a-nitro- 
c-nitro- 
l 
500 
/ 489 neutral 
\494 alkali 
b- or c-oxy- 
a-cZ-dioxy- . 
ad-dim ethoxy- 
b-c-dimethoxy- 
abc-trimethoxy 
a-/-gr-J-fc-pentabromo- 
c-f-g-j-Jc- 
a-c-f-g-j-k-hex&bromo- 
a-d-f-g-j-k- 
a -nit r o -f— g— j -k-tetrabromo- 
c- „ „ ,, 
f-k-dinitro-g-j -dibromo 
(" methyleosine ") 
f-g-j-k-tetrachloro- 
abcdfgjk-octochloro- . 
-octobromo- . 
f-g-j-k-tetriodo- "\ 
(erythrosine) J 
acdfgjk-heptabromo- . 
abc-trichloro-fgjk-tetrabromo- 
abcd-tetrachloro-o-iodo- 
„ fyf-iodo-fkj-tribromo- 
[" /3-orcinphthalein " . 
} 
492 
493 
499 
496 
499 
529 
526 
535 
539 
530 
529 
522 
518 
537 
544 
525 
540 
536 
520 
543 
440]| 
463] 
[" Tribromo-/3-orcinphthalein " 
§ 494 neutral] 
\499 alkali] 
Oxyquinoltetrachlorphthalein 577+530 
[" Quinolphthalein ' 
* This may be abd : there is no means of deciding. 
f The substances in brackets are related to fluorescein but are not direct derivatives. 
13 
