XXIV CONTENTS. 



PAGE 



Visihilitu of Ruled Lines Part 3 439 



Home-made Suhstage Condenser „ 440 



Work-taUe 440 



Testing Microscope Objectives „ 441 



Lamp-shade „ 441 



Bausch and Lomb's Optical Go's New Binocidar ., ., Part 4 548 



Fuse's Portable Dissecting 3Ticroscopc. ( Figs. 91 a7id 92) „ 550 



Holman Lantern Microscope. {Fig. 93) „ 551 



Nelson's Student's Microscope. {Fig. 94) „ 554 



Watson's Portable Swinging Mirror and Svhstage Micro- 

 scope. {Fig. 95) „ 554 



Walmsley's Photographic Apparatus. {Fig. 96) . . . , „ 556 



Hauer's PhotograjMc Apparatus. {Fig. 97) „ 559 



Seibert and Krafft's Small Camera Lucida. {Fig. 98) . . „ 560 



Winkel's Small Camera Lucida. {Fig. 99) „ 560 



Correction of the Distortions produced by the Camera 



Lucida. {Figs. 100-102) „ 560 



Measurement of 3ficroscopical Magnitudes, {Fig, 103) ., „ 567 



Simple and Cheap Eye-piece Micrometer ,, 570 



Nelson's New Nose-piece Adapter. {Fig. lOi) „ 572 



Curties' Nose-piece Adapter. {Fig. 105) „ 572 



Zeiss's Stage- Micrometer. {Fig. 106) „ 573 



Queen's Holder for Woodward's Prism. {Fig. 101).. ., „ 573 



Impromptu Condenser „ 574 



Illumination by Sunlight „ 574 



Blu£-tinled Lamp-chimneys, Light-moderators, ^c „ 575 



Thompson's Polarizing Prism, (i^j^s. 108-112) .. .. „ 575 



Depth of Vision in Photomicrography „ 579 



Value of Photography in Microscopical Investigations . . „ 580 



Abbe's Befractometer. (FiV/s. 113-116) „ 581 



Refractive Indices and Dispersive Pou-ers of Solids and 



Fluids „ 587 



" The Genus Microscopista" „ 589 



Aylward's Camera Lucida ,, 593 



Possible Error in Micropetrographic Measurements ., ., „ 594 



Amphipleura pellucida by Central Light „ 595 



Prisms v. MiiTors „ 595 



Rogers' Standard Micrometer „ 619 



Bailey's Portable Microscope. {Figs. 120 and 121) .. .. Part 5 697 

 Chevallier's Inclining Microscope {large model), {Figs, 



122-124) „ 698 



Chevalier's Microscopes. {Fig. 125) „ 700 



Hirschwald's Microscop)e-Goniometer. {Figs. 126 and 127) „ 700 



Plussl's Large Stand. {Fig. 128) „ 703 



Su-ift and Son's Radial Inclining Microscope. {Figs, 129 



a7idl30) „ 704 



Projecting Lanterns „ 706 



Assyrian Lens. {Figs. 131 and 132) „ 707 



Lindsay's Microscope. {Figs. 133 and 131) ,, 708 



Janssen's Microscope, {Fig. 135) ,, 708 



