CONTENTS. XXlll 



PAGE 



DeechJs Large Microscope. (J'j^s. 39-41) Part 2 268 



Eobln's (^Chevalier) Dissecting Microscope. (Fig. 42) . . „ 271 



Eollefs Polari-spectro-microscope. (^Figs. 43-45) . . . . „ 272 



Verick's Travelling or Pocket Microscope. (Figs. 46 and 47) „ 277 



Ahhe's Camera Lucida. (Fig. 48) „ 278 



Hilgendorf s " Apparatus for Microscopical Geometrical 



Drawings" „ 279 



Wenham's Mechanical Stage. (^Fig. 49) „ 280 



Altmann's " Abend-Condenser " „ 281 



Thoulet's Heating Apparatus „ 281 



Ahhe's Test-plate „ 281 



Eow # Co.'s Pocket Lamp. (Fig. 50) „ 283 



Drawings and Paintings from the Microscope „ 283 



Double Illumination for Insects mounted without Pressure ,, 285 

 Behrens' Guide to Microscopical Researches in Botanical 



Laboratories ,, 285 



' Micrographic Dictionary ' ,, 286 



Electric Illumination for the Microscope „ 287 



Correction-adjustment for Objectives „ 288 



Podura Scale „ 290 



Resolving Amphipleura pellucida „ 290 



Correction-collar to Zeiss's Homogeneous-immersion Objectives „ 314 



Heliotype Photo-micrographs of Mosses, ^-c „ 318 



New Form of Abbe Condenser „ 319 



Portable Form of Aeroscope and Aspirator. (_Figs. 58 and 59) Part 3 338 

 Bertrand's Petrological Microscope. (^Figs. 60-62) . . . . „ 413 

 Fase's Portable Binocular Dissecting and Mounting Micro- 

 scope. (Fig. 63) „ 415 



El'dnne and Mailer's and Seibert's Demonstration Micro- 

 scopes. (Figs. 64 anii 65) „ 417 



Seibert's Travelling Microscope. (Fig. 66) „ 418 



Elonne and Mailer's " Pendulum Stage." (Figs. 67 and 68) „ 418 



Leiter and Mikulicz's G astroscopes. (Figs. 69 and 70) .. „ 421 



Cobweb Micrometers „ 422 



Chevalier's Camera Lucida. (Fig. 71) „ 423 



Grunow's Camera Lucida. (Fig. 72) „ 423 



Holle's Drawing Apparatus „ 423 



Manipulation of the Beck Vertical Illuminator „ 424 



Pease's " Facility " Nose-piece. (Fig. 73) „ 425 



German " Cylinder Diaphragms " and Condensers. (Figs. 



74-77) „ 426 



Pinkernelle's Apparatus for the Examination of Fluids. 



(Fig. IS) 427 



Moist Chamber „ 428 



Hartnack and Prazmowski's Polarizing Prism. (Figs. 79-82) „ 428 

 Apparatus for Rotating Polarizing Objects. (Figs. 83 and 



84) „ 434 



Abbe's Spectro-polarizator. (Fig. 85) „ 435 



Hartnack's Illuminating Apparatus for Monochromatic 



Light. (Fig. 86) „ 436 



Physiology of Variable Apparent Magnification by the Micro- 

 scope , 437 



