[131] The details of this curious subject may be studied in the following memoir and communications:--_On vision and the action of light on all bodies_: by Professor Ludwig Moser, of Königsberg; from Poggendorff’s Annalen, vol. lvi. p. 177, No. 6, 1845. _Some remarks on Invisible Light_: by Professor Ludwig Moser, of Königsberg; from Poggendorff’s Annalen, vol. lvi. p. 569, No. 8. _On the power which light possesses of becoming latent_: by Professor Ludwig Moser, of Königsberg; from Poggendorff’s Annalen, vol. lvii. No. 9, p. 1. 1842. _On certain spectral appearances, and on the discovery of latent light_: by J. W. Draper, M.D., Professor of Chemistry in the University of New York; Phil. Mag. p. 348, Nov. 1842. _On a new imponderable substance, and on a class of chemical rays analogous to the rays of dark heat_: by Professor Draper; Phil. Mag., Dec. 1842. _On the action of the rays of the solar spectrum on the Daguerreotype plate_; by Sir J. F. W. Herschel, Bart.; Phil. Mag., Feb. 1843. See remarks in this paper on the use which Moser has made of coloured glasses: also a communication by Professor Draper, _On the rapid Detithonizing power of certain gases and vapours, and on an instantaneous means of producing spectral appearances_: Phil. Mag., March 1843; and _On the causes which concur in the production of the images of Moser_: Comptes Rendus, Nov. 1842. See _Scientific Memoirs_, vol. iii.

[132] This fact was first observed by myself, and described in the paper already referred to, Philosophical Magazine, vol. xxii. p. 270. It does not, however, appear to have attracted the attention of any other observer.

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[133] _On Thermography, or the Art of copying Engravings or any printed characters from paper or plates of metal, and on the recent discovery of Moser, relative to the formation of images in the dark_, by Robert Hunt: Reports of the Royal Cornwall Polytechnic Society for 1842, and Philosophical Magazine, vol. xxi. p. 462.--_On the Spectral Images of M. Moser_, by Robert Hunt: Philosophical Magazine, vol. xxiii. p. 415.

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[134] _Catalytic force, or attraction of surface concerned in the diffusive power of gases: an occult energy or power in saturated saline solutions_; Prater.--Mechanic’s Magazine, vol. xlv. p. 106. _Ueber elektrische Abbildungen_; by G. Karsten.--Poggendorff’s Annalen, vol. lvii. p. 402.--Melloni and Brewster may be consulted for much that is most remarkable connected with radiation from coloured surfaces.

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