CH. /.] MICROSCOPE AND ACCESSORIES 33 



seen that the eye-point is nearer the eye-lens in high than in low ocu- 

 lars, that is the eye-point is nearer the eye-lens for an ocular of small 

 equivalent focus than for one of greater focal length. 



REFERENCES FOR CHAPTER I 



In chapter X will be given a bibliography, with full titles, of the works and 

 periodicals referred to. 



For the subjects considered in this chapter, general works on the microscope 

 may be consulted with great advantage for different or more exhaustive treatment. 

 The most satisfactory work in English is Carpenter-Dallinger, 8th Ed. For the 

 history of the microscope, Mayall's Cantor Lectures on the microscope are very 

 satisfactory. For a continuation of the history begun by Mayall in the Cantor 

 Lectures see Nelson, Journal of the Oueckett Micr. Club, and the Jour. Roy. 

 Micr. Soc, 1S97-1901— . Carpenter-Dallinger, 8th Ed. Petri, Das Mikroskop. 



The following special articles in periodicals may be examined with advantage : 



Apochromatic Objectives, etc. Dippel in Zeit. wiss. Mikr., 1886, p. 303 ; also 

 in the Jour. Roy. Micr. Soc, 1S86, pp. 316, 849, 11 10, ; same, 1890, p. 480 ; Zeit. f. 

 Instrumentenk., 1890, pp. 1-6 ; Micr. Built., 1891, pp. 6-7. 



Tube-length, etc. Gage, Proc. Amer. Soc. Micrs., 1887, pp. 168-172 ; also in 

 the Microscope, the Jour. Roy. Micr. Soc, and in Zeit, wiss. Mikr., 1887-8. 

 Bausch, Proc. Amer. Soc. Micrs., 1890, pp. 43-49 ; also in the Microscope, 1890, 

 pp. 2S9-296. 



Aperture. J. D. Cox, Presidential Address, Proc. Amer. Soc. Micrs., 1884, pp, 

 5-39, Jour. Roy. Micr. Soc, 1881, pp. 303, 348, 365, 388 ; 1882, pp. 300, 460 ; 1883, 

 p. 790 ; 1884, p. 20. Czapski, Theorie der optischen Instrumente nach Abbe. 

 See also references in \ 34. 



The Barnes Dissecting Microscope ( The Bausch & Lomb Optical Company) . 



