XXll CONTENTS. 



PAGE 



Browning's Portable Microscope, ( Figs. 30 and 31) . . Part 2 252 



Harting^s Binocular llicroscope. {Figs. 32 ami 33) . . „ 253 



Nachefs Double-bodied Microscope-tuhe. {Figs. 3-1 and 35) „ 255 

 Wenhamh Universal Inclining and Rotating Microscope. 



{Plate IV.) {Figs. 36-39) „ 255 



Bausch and Lomb Optical Co.'s Trichinoseope. {Figs. 40 



and-il) „ 258 



" Hampden" Portable Simple ^Horoscope. {Figs. 'i2 and iS) „ 258 



Excluding Extraneous Light from the Microscope ., .. „ 260 



Nachefs Improved Camera Lucida. (Fi^s. 44-46) .. .. „ 260 



Abbe's Camera Lucidii. {Fig. 47) ,, 261 



Curtis's Camera Lucida Drawing Arrangement „ 262 



Drawing on Gelatine with the Camera Liicida „ 262 



Iris-Diaphragm for vanjing the Apierture of Objectives. 



{Figs. iS and id) , 262 



Gundlach ^-inch Objective „ 263 



Scratching the Front Lenses of Homogeneous-immersion 



Objectives ,, 264 



Fluids for Homogeneous Immersion „ 264 



Advantage of Homogeneous Immersion „ 265 



Vertical Hluminator for examining Histological Elements . . „ 266 



Griffith's Parabolic Peflector „ 266 



Forrest's Compressorium. {Fig. 50) „ 266 



Juliens Stage Heating Apjparatus. {Figs. 51 and 52) . . „ 266 

 Beck's Achromatic Condenser for Dry and Immersion 



Objectives. {Figs. 53 and 54) „ 270 



Pennock's Oblique Diaphragm. {Fig. 55) „ 270 



Stereoscopic Vision with Non-stereoscopic Binocular Ar- 

 rangements. {Figs. 56~5S) „ 271 



Dark-field Illumination by the Bull's-eye Condenser . . . . „ 273 



Svhstitute for a Revolving table „ 273 



Kitton's Hollow Glass Sphere Illumination „ 273, 4 



The Relation of Aperture and Power in the Microscope . . Part 3 300 



Griffith's Portable Microscope , 395 



Parkes' Class Microscojx. {Fig. 61) „ 395 



Pringsheim's Photo-chemical Microscope. {Fig. 62) . . . „ 395 

 Waechter's {or Engell's) Class or Demonstrating Microscope. 



{Figs. 63 and 64:) , 398 



Wasserlein's Saccharometer Microscope. {Fig. 65) . . . . ,, 399 



Wenha7n's Universal Inclining a>id Rotating Microscope .. „ 400 



Briicke Lens „ 400 



Bausch and Lomb Handy Dissecting Microscope, {Fig. 66) „ 400 



Excelsior Pocket and Dissecting Microscope. {Fig. 67) . . „ 401 

 Hartnacli's Draiving Apparatus {His's Embryograph). 



{Fig. 6S) „ 402 



Drawing from the Microscope „ 404 



Ulmer's Silk Thread Movement. {Figs. 69-72) , 406 



Diaphragms for Limiting the Apertures of Objectives. {Fig. 13) ,, 407 



Correction-adjustment for Hoinogeiieous-immersion Objectives „ 407 



Hitchcock's Modified Form of Vertical Illuminator ., .. „ 409 



