Miss Homer, A new coloured fluorescent hydrocarbon. 195 
The bands were measured in solutions of the hydrocarbon 
in benzene, toluene, xylene, alcohol and glacial acetic acid. In 
each case '00508 grs. of the hydrocarbon were dissolved in 100 c.c. 
of the solvent and the same width of tube was used. Control 
experiments were done with the solvents used, and in each case 
the bands were due to the hydrocarbon itself. The position of 
the second band could not be easily read with the naked eye 
as it was near the limit of the visible part of the spectrum. 
Its existence was definitely proved by taking a series of photo- 
graphs. 
The position of the band in the blue part of the spectrum was 
measured in terms of wave-lengths. 
Strength of 
solution using 
same width 
of tube 
Solvent 
Limit towards 
the red end. 
Wave-length 
Limit towards 
the blue end. 
Wave-length 
Maximum 
Intensity 
•00508 
Benzene 
4448 
4379 
4425 
•00508 
Toluene 
4446 
4385 
4425 
•00508 
Xylene 
4447 
4390 
4423 
■00508 
Alcohol 
4400 
4350 
4375 
•00508 
Glacial Acetic Acid 
4395 
4340 
4370 
The position of the absorption band is approximately the same 
for solutions of the hydrocarbon in benzene, toluene, and xylene, 
whereas it is shifted towards the violet end in solutions in acetic 
acid and in alcohol. 
The second band, for solutions of '0108 u / o strength, lies approxi- 
mately between the limits A, = 4170 and \ = 4100. 
Photographs shewed that the strong band in the blue region 
of the spectrum is in reality a double band. The naked eye was 
unable to detect the faint line of demarcation between the two 
constituent bands. 
Nitro- and brom-compounds of this hydrocarbon are non- 
Huorescent in solution. c 
