CH. XII] HISTORY OF LENSES AND MICROSCOPES 443 



tion of eye-glass (oculars) for such telescopes as may be applied to mathe- 

 matical instruments. (Pp. 94-98, i plate. In Vol. LXXIII, 1783.) 



RISNER, J. See Alhazen. 



SCHEINER, C. Rosa Ursinae, 1826-1830. Action of the eye, p. 108; The tele- 

 scope and microscope and projection therewith, p. 130. 



SPENCER & TOLLES. See Krauss, Trans. Amer. Micr. Soc., 1901, pp. 19-29. 

 History of their contributions to microscopy. 



TOLLES- SPENCER. See Cox, Trans. Amer. Micr. Soc., 1884, pp. 5-39; Krauss, 

 Trans. Amer. Micr. Soc., 1901, pp. 19-29; Mayall, Hist. Micr., pp. 95-96. 



WALGENSTEN'S magic lantern. Milliet de Chales, q.v. 



YOUNG, THOMAS. On the mechanism of the eye, 1800, in Philos. Trans. Roy. 

 Soc. London, 1801, pp. 23-88. On pp. 39-40 he describes astigmatism, and 

 shows that it can be corrected by tilting the spectacles. See Airy. 



ZAHN, J. Oculus artificialis teledioptricus, etc., 1702. Many figures of optic 

 apparatus at that time. 



History of Dark-field Microscopy. 



CARPENTER, WM. B. The Microscope and its revelations, 1856-1881. 

 EDMUNDS, J. On a new immersion paraboloid. Mon. Micr. Jour., Vol. 18, 



1877, pp. 78-85. 

 GAGE, S. H. Modern dark-field microscopy and the history of its development. 



Trans. Amer. Micr. Soc., Vol. 39, 1920, pp. 95-141. 

 HALL, J. C. Quart. Jour. Micr. Sci., Vol. IV, 1856, pp. 205-208. Figures the 



"spotted lens." 



LISTER, JOSEPH JACKSON. Trans. Roy. Soc., Vol. 120 (1830), pp. 187-200. 

 QUEKETT, JOHN. Practical treatise on the use of the microscope. Editions of 



1848, 1852, 1855. 



READE, REV. J. B. See pp. 227-231 of Goring & Pritchard. 

 SHADBOLDT, G. Trans. Micr. Soc. London, Vol. Ill (185^), pp. 132, 154. 

 SIEDENTOPF, H. Vorgesichte der Spiegelkondensoren, Zeit. wiss., Mikr., Vol. 



XXIV (1907), pp. 382-395- 

 WENHAM, F. H. Reflecting condensers, Trans. Micr. Soc. London, Vol. Ill, 1850, 



pp. 83-90. Quart. Jour. Micr. Sci., Vol. II, 1854, pp. 145-158. Trans. Micr. 



Soc. London, in Vol. IV, 1856, Quart. Jour. Micr. Sci., pp. 55-60. 



