"the paint is laid on so thickly that it is frequently impossible to see the engraved lines underneath. The already rich colouring is heightened by the addition of burnished highlights, albumen overglazes and metallic paints to give an overall effect reminiscent of the work of a miniaturist. Surprisingly, these techniques were often combined to produce a very pleasing and delicate effect: the multiple ruses of the colourist triumph over the draughtsman's numerous failures. Donovan overreached himself and died penniless ." (Dance, Art of natural History p. 87)