CONTENTS. xxiii 



Fiesch's Finder. (Figs. 74 and 75) Part 3 409 



Burnett's Botating Live-Box „ 410 



Schklarewski's Hot-water Stage. (Fig. 76) „ 411 



Abbe's Condenser. (Figs. 77 and 78) „ 41 1 



Bausch and Bomb's Immersio'a Illuminator ,, 412 



Bausch's Paraboloid ,, 412 



Browning's Simple Heliostat. [Fig. 79) „ 413 



Hay em and Nachet's Modified Earnatometer. (Figs. 80-82) „ 413 



Fasoldfs Test-plate ' ^^ 415 



High Resolving-power 416 



Binocular Microscopes 416 



Electric Light in Microscopy , 418 



Definition of Natural and Artificial Objects „ 420 



Cole's " Studies in Microscopical Science " , 420 



Journal of the Postal Microscopical Society , 421 



Apparatus for obtaining Monochromatic Light „ 422 



Improvements in Seibert and Krafffs Microscope . , . . „ 423 



Meaning of Sign X (Cf. also pp. 564, 746, and 864) .. „ 423 



Apparatus for Drawing Objects 424 



Use of Diaphragms 44I 



ITie Relation of Aperture and Power in the Microscope — 



(continued) Part 4 460 



Lossner's Tele-microscope 547 



Prazmowski's Micrometer Microscope. (Fig. 91) . . . , 547 

 Simplified Beading Microscope for Horizontal and Vertical 



'''"('^^^ „ 548 



Swift's Tank Microscope. (Fig. 92) . . 549 



Teasdale's Field Naturalist's Microscope. (Figs. 93 and 94) , 549 



Steinheil's Achromatic Eye-pieces. (Figs. 95 and 96) , . 549 



New Combination for Objectives 55I 



Fluid for Homogeneous Immersion 55I 



Shurley's Improved Slide for the Examination of Gaseous 



Matter. (Fig. d7) , 55I 



Hardy's Compressorium. (Fig. 98) 553 



Bulloch's Diatom Stage 554 



Substage Fine-adjustment. (Fig. 99) 554 



Sidle's Centering Substage. (Fig. 100) 554 



Mounting for the " Woodward" Prism. (Figs.lOl and 102) „ 554 



Prisms versus the Hemispherical Lens as Illuminators . . „ 556 



Radial Tail-pieces 557 



Electric Light in Microscopy. (Figs. 10^ and 10^) .. .. „ 557 



Black Backgrounds 559 



Micrometrical Measurement by means of Optical Images . . „ 559 



Malassez's Improved Compte-globules. (Figs. 105-108) . . „ 559 



Backgrounds, Light-modifiers, ^c 565 



Powell's -^-inch Oil-immersion Objective 565 



Tadpole Slide ggg 



Impromptu Bramhall Reflector 567 



Bausch and Lomh Optical Co.'s Professimal Microscope. 



(^i/-113) Parts 666 



