ii4 



INTERPRETATION OF APPEARANCES [CH. Ill 



binocular is properly adjusted for his eyes. (See Carpenter- 

 Dallinger for fuller discussion of Binoculars. ) 



103 104 



Fig. 103. Sectional View of Wenham's Binocular Microscope, a. Tin- 

 prism which e a- lends partly across the field and directs about half of the light 

 to the left eye (L). A part of the light extends directly to the right eye (R). 

 c, b. Field lenses of the right and the left oculars. 



Fig. 104. An enlargement of the Prism used in the H'enham Binocular 

 Microscope, a, b, e, d Represent the course of the ray for the left eye. It is 

 internally reflected at the points />, c, and given the proper direction to enter 

 the left eye. 



REFERENCES FOR CHAPTER III. 



For general discussions : Carpenter-Dallinger, A. E. Wright, Principles of 

 Microscopy, Ch. V.; Beale ; Spitta, Microscopy, Ch. xviii.; Beck's Cantor 

 Lectures, lect. IV. 



For pedesis see Carpenter-Dallinger, p. 431 ; Beale, p. 195 ; Jevons in 

 Quart, four. Science, n. s., Vol. YIII (1S78), p. 167. 



For the original account of this see Robert Brown, " Botanical appendix 

 to Captain King's voyage to Australia," Vol. II, p. 534 (1826). 



See also Dr. C.Aug. Sigtu. Schultze, " Mikroskopische Untersuchungen 



