43 samples (in small glass stoppered jars) illustrating the relationship of chemical structure and colour, descriptive labels of above. Nos. 1-25 are series of ozo-dyes derived from Aminosulphonamides, marked with an A, others in Colour and Constitution Series, nos. 17-21, 7-11, 34-41, 1890-1911 43 chemical samples in small glass stoppered jars 1890-1911