x LIST OF ILL USTRA TIONS. 



57. Cover correction by changing tube-length 54 



58. Screen for face and microscope 56 



59. Ward's eye shade (Cut loaned by Queen & Co.) 59 



60. Double eye-shade 59 



61-63. Marker, sectional view (Proc. Amer. Micr. Soc, 1894) 64 



64-66. Specimens showing the use of the marker 64 



67. Krauss' method of marking objectives on a nose-piece (from Dr. Krauss, 



see Proc. Amer. Micr. Soc, 1895) 65 



68. Removable mechanical stage (Leitz catalog) . . • * 65 



69. Removable mechanical stage (Bausch & Lomb Opt. Co.) 65 



70. Zeiss' Microscope la with mechanical stage (Zeiss' catalog, No. 30) ... 66 



71. Watson & Sous, Edinburgh, student's microscope (Watson & Sons catalog) 67 



72. Nachet et Fils microscope No. 4 with movable stage (cut loaned by the 



Franklin Educational Co. ) 68 



73. BB Microscope of the Bausch & Lomb Optical Co. (B & L) 69 



74. Reichert's microscope Illb (cut loaned by Richards & Co. ) 70 



75- Queen & Co. 's microscope II of the continental pattern (Q. & Co.) ... 71 



76. Leitz' microscope lb (cut loaned by Wm. Krafft) 72 



77. Ross eclipse microscope (cut from Walmsley, Fuller & Co.) 73 



78. AA. Microscope of the Bausch & Lomb Optical Co. (B. & L.) 74 



79. Beck's star microscope (cut loaned by Williams, Brown & Earle) .... 75 



80. Zentmayer's clinical microscope (Zentmayer) 76 



81. Zentmayer's microscope, No. V (Zentmayer) 76 



82. Leitz' demonstration microscope (from Wm. Krafft, N. Y.) 77 



83. Leitz' microscope IV (from Wm. Krafft, N. Y.) 77 



84. Queen & Co.'s acme microscope, No. IV (Q. & Co.) 78 



85. Mcintosh's scientific microscope, No. 2 (Mcintosh Battery Co.) 79 



86. Letters mounted in stairs to show order of coming into focus 82 



87. Putting on a cover-glass 84 



88. Oil and air bubbles 85 



89. Glass rods in optical section 86 



90. Double contour 87 



91. Micrometer with ring to facilitate finding the lines 94 



92. Wollaston's camera lucida 95 



93. Geometrical diagram showing size of object and image 96 



94. Image and object with differing tube-length 96 



95. Standard distance for magnification with Wollaston's camera lucida ... 98 



96. Standard distance for magnification with the Abbe camera lucida .... 98 



97. Preparation of blood corpuscles with ring around a group . 101 



98-99. Ocular micrometer (Figs 33-34 repeated) 103 



100. Ocular screw micrometer (Fig. 3.5 repeated) 104 



101. Lines of stage and ocular micrometer in getting the valuation of the ocu- 



lar micrometer 107 



102. Abbe camera lucida with 45 mirror no 



103. Geometrical figure going with Fig. 102 no 



104. Ocular showing eye-point (Fig. 30 repeated) no 



105. Wollaston's camera lucida (Fig. 92 repeated) ill 



106. Abbe camera lucida with 35° mirror 114 



107. Geometrical figure going with Fig. 106 114 



108. Upper view of the prism of the Abbe camera lucida 114 



