442 HISTORY OF LENSES AND MICROSCOPES [CH. XII 



HOOKE, R. Philos. Trans. Roy. Soc., 1668, p. 741. 



HOVESTADT, H. Jena Glass, 1902. 



HUYGENS. For HUYGENS'S ocular see Nelson, Jour. Roy. Micr. Soc., 1900, 

 pp. 162-169. 



JOURNAL OF THE ROYAL MICROSCOPICAL SOCIETY. In nearly every number is the 

 announcement of some new thing pertaining to the microscope. For the special 

 purposes of this chapter attention is called especially to the volume of 1886, pp. 

 849-856, for the apochromatic objectives; to that of 1889, in which, on pp. 574- 

 598 is a translation of a paper by the eminent Italian physicist, G. Govi, on the 

 invention of the compound microscope. He contends that it was Galileo who 

 first found that the Dutch telescope could also be used as a microscope. This 

 paper may well be read in connection with the book of Borellus. 



In 1891, pp. 90-105, Mr. Nelson deals with the substage condenser, and in 

 1900, pp. 162-169, with the history of the Huygenian ocular. In 1902, 

 pp. 20-23 Mr. Nelson gives a bibliography of works (dated not later than 

 1700) dealing with the microscope and other optical matters. In 1914 Dr. 

 Jentzsch, pp. 1-16, and Conrad Beck, pp. 17-23, 205-210, deal with binocular 

 microscopes, past and present. 



In 1915 Charles Singer, pp. 317-340, deals especially with early drawings 

 made by the aid of the microscope; and in 1916, Mr. Heron- Allen and Ch. F. 

 Rousselet give a summary of the progress of knowledge of vision and the mi- 

 croscope from 1673-1848. 



KEPLER, J. Opera omnia, Vol. n. See in Paralipomena, Caput V, for the 

 action of the eye and of spectacles, especially pages 255-262. And in the 

 Dioptrica, pp. 529-556, for the eyes and for combinations of lenses. 



MAYALL, J. History of the microscope, 1885. 



MILLIET DE CHALES. Mundus mathematicus, 1674. Figure of Walgensten's 

 magic lantern, Vol. II, p. 666. 



MOLYNEUX, WM. Dioptrica nova, 1692. Excellent on history. 



NACHET. Sur un nouveau microscope approprie aux besoins des demonstrations 

 anatomique, et permettant a plusieurs personnes d'observer ensemble. Compte 

 rendu des stances de la Societe de Biologie, Oct. 1853. pp. 141-145. In this 

 article is described and illustrated forms of microscopes with two tubes for 

 two observers, and with three tubes for three observers. See also Harting, 

 Vol. Ill, pp. 243-248. See also plates I-II in the Dutch edition of 1858. 



NEWTON, SIR ISAAC. Optics, 1704. 



PANSIER, P. Histoire des lunettes (spectacles), 1901. 



PETRI, R. J. Das Mikroskop (History). 



PRIESTLEY, J. History. Vision, light, and colors. 1772. 



PTOLEM^EUS, C. Optics (70-147 A.D.). 



POGGENDORFF, J. C. Geschichte der Physik, 1879. History. 



RAMSDEN, J. Philos. Trans. Roy. Soc., 1782. A description of a new construe- 



