LIST OF IL L USTRA TIONS. xi 



109. Quadrant attached to the mirror of the Abbe camera lucida 114 



no. Inclined microscope with the Abbe camera lucida 115 



111. Drawing board for the Abbe camera (The Bausch & Lomb Opt. Co.) . . 116 



112. Micrometer lines indicating the scale of a drawing 118 



113. Longisection of the Abbe micro-spectroscope (cut loaned by the Bausch 



& Lomb Opt. Co.) 121 



114. Slit mechanism of the micro-spectroscope (from B. & L. ) 121 



115. Various spectrums 122 



116. Absorption spectrum of hemoglobin, etc. (Gamgee & McMunn) .... 124 



117. Section of the micro-spectroscope 126 



118. Prism showing apparent reversal of colors 126 



119. Section of a micro-polariscope 126 



120. Micrometer calipers (Brown & Sharp) 143 



121. Cover-glass measurer (The Bausch & Lomb Opt. Co.) 144 



122. Zeiss cover-glass measurer (from Zeiss' catalog) 145 



123. Putting on a cover-glass ( Fig. 87 repeated) 146 



124. Needle holder (Queen & Co.) 146 



125. Turn table (Queen & Co. ) 148 



126. Centering card 149 



127. Anchoring a cover-glass 150 



128. Irrigation, staining, etc., under the cover 150 



129. Moist chamber for fibrin, blood corpuscles, etc. (from Proc. Amer. Micr. 



Soc, 1891) 151 



130. Adjustable lens holder (Leitz, cut from Wm. Krafft) 155 



131. Adjustable lens-holder (The Bausch & Lomb Opt. Co.) 156 



132. Preparation vials (Proc. Amer. Micr. Soc, 1895) 159 



133. Pipette for stains, etc. (Whitall, Tatutn & Co.) 161 



134. Waste bowl with rack and funnel (cut loaned by Wm. Wood & Co.) . . 162 



135. Round aquarium for waste bowl, rinsing jar, etc. (Whitall, Tatum & Co.) 162 



136. Glass box for cleaning slides and covers (Whitall, Tatum & Co.) . . . . 162 



137. Balsam bottle 164 



138. Serial section slide, showing order of arranging sections 170 



139. Writing diamond (Queen & Co.) 173 



140. Drawer of cabinet for slides (Proc. Amer. Micr. Soc., 1883) 174 



141. Cabinet for microscopical specimens (Proc. Amer. Micr. Soc, 18S3). . . 174 



142. Czapski's iris diaphragm ocular (Zeiss' catalog, No. 30) 181 



143. Walmsley's large photo- micrographic camera (from Mr. Walmsley) . . . 186 



144. Leitz' vertical photo micrographic camera (from Wm. Krafft) 188 



145. Projection oculars (Fig. 32 repeated) 189 



146. Walmsleys autograph camera in a vertical position (from Mr. Walmsley) 190 



147. Same in horizontal position 192 



148. Vertical photo-micrographic camera (the Bausch & Lomb Opt. Co.) . . 193 



149. Zeiss' 70 millimeter projection objective (from Zeiss' photo-micrographic 



catalog) 195 



150. Focusing screen 195 



151. Perigraphic photographic objective (The Gundlach Opt. Co.) 196 



152. Zeiss anastigmatic photographic objective (from the Bausch and Lomb 



Opt. Co.) i 9 6 



153. Focusing glass (from the Gundlach Opt. Co.) 197 



154. The tripod as a focusing glass 198 



