314 



CATALOGUE, — PHYSICAL OPTICS. 



The lights appeared to answer to the shades ot a perfect 

 shadow, except when part of the sun's disc was covered 

 by clouds. Hence the effect must have been owing to the 

 penumbra. Y. 



Jordan on the spectre of the Brocken. Ph. 

 M. I. 232. 



A shadow falling on clouds. 



Gilb. XVII. 183 



Castberg thinks the fata morgana at Reggio a shadow 

 thrown on a mist. 



Colours, as aff'ecting the Ei/e. 

 Waller's catalogue of simple and mixed co- 

 lours. Ph, tr. 1686. XVI. 24. 



With specimens annexed, many of which now only serve 

 as tests of the want of permanence of the colours employed. 



Ph. tr. 1716. XXIX. 449,451. 



A different colour being viewed with each eye at the 

 same time, the result is not a mixed colour, but a contem- 

 poraneous sensation of both. Sometimes the colours appear 

 to succeed each other alternately. Y. 



Lambert's farbenpyramide. 4. Berl. 1772. 



Dicquemare on the vision of colours. Roz. 

 VIII. 64. 



Prangens farben lexicon. 4. Halle, 1782. 



Opoix on colours. Roz. XXIIl. 402, 



Opitz sur les couleurs. MS. R. S. 



Mayer de affinitatecolorum. Op. ined. I. 31. 



Saussure on the light required for viewing dif- 

 ferent colours. Mem. Tur. 1788. IV. 441. 



Says, that an electric spark in a Torricellian \acuum with 

 a few drops of ether appears green to an eye near it, and red 

 at the distance of a few yards. Probably some imperfection 

 of the focus was concerned. 



Analytical determination of tints in painting. 



Journ. polyt. I. i I67. 

 Barker's patent panorama. Repert. IV. 165, 



Montucla and Lalande. III. 565. 



Ocular Spectra and coloured shadows. 



Jurin in Smith's optics. 



Buifon on accidental colours. A. P. 1743. 



147. H. 1. 

 Aepinus's optical observations. N. C. Petv. 



X. 282. Roz. XXVI. 



Darcy. A. P. 1765. 



Beguelin on coloured shadows. A. Berl. 1767. 



27. 

 Beguelin on a deception of sight with respect 



to colour. A. Berl. 1771.8. 

 Franklin's experiments and observations. 



Lond. 1769. 470. Roz. II. 383. 

 Mongez on ocular spectra. Roz. VI. 481. 

 Mongez on blue shadows. Roz, XII, 127. 

 Godard on ocular spectra, Roz. VII. 509. 



VIII. 1, 269, 341. XXV. 219. 

 Dicquemare on illusions of sight. Roz. XI. 



403. 



Legentil on objects viewed through coloured Observations sur les ombres color^es.' 8. Par. 



glasses. Ann. Ch.X. 225. 

 Herschel on the illumination of different 



colours. Ph. tr. 1800. 255. 



The greenish yellow rays the brightest. 



Aerial Perspective, and management of colours. 

 Lambert on photometry, as subservient to 



painting. A. Berl. 1768. 80. 

 Lambert on aerial perspective. A. Berl. 1774. 



74. 

 Pfannenschmid uber das mischen der farben. 



S.Hann. 1781. 

 Prangens schule der mahlung. 8. Halle, 1782. 

 Morgan.Ph.tr, 1785. 



1782, 

 Scherffer and Aepinus on accidental colours. 



Roz. XXVI. 175,273,291. 

 *R. W. Darwin on ocular spectra. Ph. tr. 



1786. 313. 



Explains some phenomena very satisfactorily fiora the 

 contrast of sensations ; but others might be better understood 

 from the analogy of coloured shadows, especially Ihe direct 

 spectra. Darwin thinks, that the stimulus of light accord- 

 ingly as its intensity becomes greater, produces, first simple 

 spasmodic action ; 2, intermittrng spasmodic action ; 3, 

 opposite spasmodic action ; 4, various successive actions; 

 5, fixed spasmodic action ; 6, paralysis. Mentions the 

 effect of light coming, through the eyelifls, and a mode of 

 observing the circulation of the blood in the eye. 



