CATALOGUE. — PHYSICAL OPTICS, 



315 



On accidental colours. Roz. XXX. 407. 



Marat sur la lumi^re. 



Monge on coloured shadows. Ann. Ch. III. 



131. 

 Rumford on coloured shadows. Ph. tr. 1794. 



107. Nich. I. 101. 



Shows that they are mere fallacies. 

 Hassenfratz on coloured shadows. Journ. 

 polyt. IV. xi. 272. Nich. VI. 282. VII. 

 23.. 



Impirfectiom of sight. 



Defects of focal distance. 



i-Myopibus juvamen. R. H. Hooke. Ph. coll. 

 n. 3. p.5!j. 



Lahire on the use of spectacles. A. P. IX. 

 366.417. 



Desaguliers on telescopes for myopic per- 

 sons. Ph. tr. 1719. XXX. 1017. 



On the effect of glasses upon the flexibility 

 of sight. A. P. 1770. H.50. 



Spectacles. E. M. A. IV. Art. Lunettier. 



Henry on a person becoming short sighted 

 in advanced age. Manch. M. III. 182. 

 At 50, probably from reading a small print frequently 



without much light. » 



Richardson's patent spectacles. Repert. X. 

 145. 



With additional glasses, which raay be turned back at 

 pleasure. 



Woliaston's improved periscopic spectacles. 

 Nich. VII. 143, 241. Ph. M. XVII. 327. 

 XVIII. 165. 



Meniscus lenses. 



Jones on Woliaston's spectacles. Nich. VII. 



192. VIII. 38. Ph. M. XVIII. 6.5, 273. 

 i-E. Walker on spectacles. Nich. VII. 291. 



Imperfection of focus. 

 Lahire on the obliquity of the crystalline 

 lens. A. P. IX. 399. 



Aepinus on the apparent diameter of a small 



hole. N. C. Petr. VII. 303. 

 Telescopic appearances of stars. Herschel. 



Ph. tr. 1782. 

 Stack on improving defective sight. Ir. trans. 



1788. II. 27. 



Supposes myopia to depend on aberration. 

 Irradiation. See diffraction, as affecting 



astronomical observations. 



Squinting. 

 Buffon. A. P. 1743. 231. H. 68. 

 Dutour. S. E. VI. 470. 

 Darwin. Ph. tr. 1778. 86. 

 Arnim on a case of double vision. Gilb. III. 

 249. 



Confusion of colours. 



Ph.tr. 1738. 



All objects appeared red to some persons who had eaten 

 henbane roots. 



Huddart on persons who could not distin- 

 guish colours. Ph. tr. 1777. 260. 

 Harris, a shoemaker, could only tell black from white ; 



had two brothers equally defective : one of them mistook 



orange for green. 



Scott's imperfection of sight. Ph. tr. 1778. 



613. 



Full reds and full greens appeared alike ; but yellows and 

 dark blues were very nicely distinguished. 

 Roz. XIII, 86. 

 Monge. Ann. Chim. III. 13I. 

 Dalton on some facts relating to the vision 



of colours. Manch. M. V. 28. 



His own case, agreeing with those of several other persons. 

 He cannot distinguish blue from pink by daylight, but by 

 candlelight the pink appears red ; in the solar spectrum 

 the red is scarcely visible, the rest appears to consist of two 

 colours, yellow and blue, or of yellow, blue, and purple. 

 He thinks it probable that the vitreous humour is of a deep 

 blue tinge : but this has never been observed by anatomists, 

 and it is much more simple to suppose the absence or para- 

 lysis of those fibres of the retina, which are calculated to 

 perceive red ; this supposition explains all the phenomena. 



