Spectropia, or, Surprising spectral illusions : showing ghosts everywhere, and of any colour : with sixteen illustrations (1864)
Filmer, John,engraver, James G. Gregory (Firm),publisher · New York : Published by James G. Gregory, no. 540 Broadway · leaf 14
of which the retinal artery will be seen emerging and spreading over the entire retina ; but in the diagram that part only is represented which could be seen tolerably Fig. I. distinct. The background to the artery appears of a pale red, except at the part occupied by the optic nerve, where it is… … her hand. The spot k, Fig. 4, when seen against a wall a Fig. 5. few feet distant, appears about the size of a human head, and wants very little to furnish it with features. Figured paper on the wall, and a ho4 of other things, may supply them, or even the retinal artery, which often lends body and…
