ABSORPTION SPECTRA. 



PLATE 17. 



FIG. 6-. 



FIG. 65. SEE NO. 103. RHODAMINE B. 



FIG. 66. SEE NO. 92. METHYL VIOLET 6B. 



FIG. 67. SEE NO. 50. WOOL BLACK. 



FIG. 68. SEE NO. 124. HELIOTROPE 2B. 



HELIOTVPE CO., 90STON 



