Hooke, in one of the earliest volumes of the Philosophical Transactions, describes as new many of the phenomena mentioned by Porta, and particularly the images of the dark chamber. [107] Herschel, _On Light_,--Encyclopædia Metropolitana. [108] “I would here observe that a consideration of many such phenomena (the obliteration and revival of photographic drawings) has led me to regard it as not impossible that the retina itself may be _photographically_ impressed by strong light, and that some at least of the phenomena of visual spectra and secondary colours may arise from the sensorial perception of actual changes in progress in the physical state of that organ itself subsequent to the cessation of the direct stimulant.”--_On the action of the Rays of the Solar Spectrum on Vegetable Colours, &c._: by Sir J. F. W. Herschel, Bart. [109] Dumeril. [110] _Theory of Colours_: by Goethe; translated by Eastlake. [111] See Tuckey’s Narrative of the Expedition of the Zaire. [112] The most complete examination of this subject will be found in two Memoirs:-- 1. _Experiments and observations on the light which is spontaneously emitted with some degree, of permanency from various bodies._--Phil. Trans., vol. xc. 2. _A continuation of the above, with some experiments and observations on solar light, when imbibed by Canton’s phosphorus_: by Nathaniel Hulm, M.D.--Phil. Trans., vol. xci.; and in the _Monograph of the British Naked-eyed Medusæ_, by Professor Edward Forbes (published for the Ray Society). See Wilson’s note to the account of _Pennalata phosphorea_ in Johnston’s Zoophytes, 2nd edition. [113] _A General Outline of the Animal Kingdom_: by Thomas Rymer Jones, F.L.S.--Acalephæ, p. 64. _Lettre à M. Dumas sur la Phosphorescence des Vers luisants_: par M. Ch. Matteucci.--Annales de Chimie, vol. ix. p. 71, 1843. [114] _Memoirs of Benvenuto Cellini--Bohn’s Standard Library._ See also his Treatise on his Art as a Sculptor and Engraver. Florence, 1568. 4to.