Note 112 — Chapter VII

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.