| Description | Small bundle of notes and pigment samples, titled "Analytic Portraiture", consisting of:
Manuscript notes titled "differential portraiture", 2 ff.
Scale and tables of values for different tints and shades; 3 ff.
Graded pencil shading on the back of an envelope.
Several strips of paper coloured with tints and pigments of various shades, allocated grades/references by Galton. |