Figure 2., Color samples of browns, p. 74, in Werner’s nomenclature of colours : with additions, arranged so as to render it highly useful to the arts and sciences, particularly zoology, botany, chemistry, mineralogy, and morbid anatomy : annexed to which are examples selected from well-known objects in the animal, vegetable, and mineral kingdoms (1821), Werner, Abraham Gottlob; Syme, Patrick, editor; James Ballantyne and Co., printer, Edinburgh : Printed for William Blackwood, Edinburgh, and T. Cadell, Strand, London (https://archive.org/details/gri_c00033125012743312 ).