XXviii CONTENTS. 



PAGE 



Rogers' New Eye-piece Micrometer .. .. Part 3 445 



Geneva Co.' s Nose-piece Adapters — Thury Adapters .. „ 445 



Selection of a Series of Objectives „ 445 



" Bigh-angled " Objectives „ 450 



Zeiss' s A * (^Variable) Objective and ^^ Optical Tube-length" 



(Fig. 59) „ 450 



Queen's Spot-lens Mounting (Figs. 60-(i2) „ 452 



Paraboloid as an Illuminator for Homogeneous-immersion 



Objectives „ 453 



Paraboloid for Rotating Illumination in Azimuth (Figs. 



63 a?id 64) „ 454 



Horizontal Position of the Microscope „ 455 



Flogel's Dark Box (Fig. 65) „ 455 



Feussner's Polarizing Prism (Figs. Q6-73) „ 456 



Abbe's Analysing Eye-piece (Fig. 74) , 462 



Measurement of the Curvature of Lenses ,, 462 



New Microscopical Journals ,, 463 



Bausch and Lomb Opticcd Co.'s Improved "Investigator" 



Stand „ 463 



Lantern Mici'oscope „ 464 



Selection of Microscopes „ 464 



Homogeneous Immersion „ 465 



Cementing Brass on Glass „ 465 



Polarizer „ 466 



Physiology of Binocular Vision with the Microscope (Figs, 80-2) „ 486 



Dark-ground Illumination for showing Bacilli of Tubercle . . ,, 497 



Admission of Ladies as Fellows „ 498-9 



On a New Form of Polarizing Prism (Figs. 87 and 88) . . Part 4 533 



Microscope with Amplifiers (Fig. 8d) „ 607 



Bausch's Binocular Microscope (Figs. 90 and 91) .. .. „ 607 

 Sohncke's Microscope for Observing Newton's Rings 



(Fig. 92) 609 



Harris and Son's Portable Microscope (Figs. 93 and 9i) .. ,, 611 



Seibert's No. 8 Microscope (Fig. 95) „ 613 



Beichert's Large Dissecting Microscope and Hand Magnifiers 



(Figs. 96 and 97) , 613 



Geneva Co.'s Dissecting Microscope (Fig. 98) „ 614 



Drallim and Oliver's Microscope Knife (Fig. 99) .. .. „ 614 



Ward's Eye-shade (Fig. 100) „ 615 



Endomersion Objectives ,, 616 



Selection of a Series of Objectives „ 620 



Correction Adjustment for Homogeneous - immersion Ob- 

 jectives „ 620 



Lighten' s Immersion Illuminator (Fig. 101) „ 621 



Illumination by Daylight and Artificial Light — Paraboloids 



and Lieherkiihns „ 621 



Bausch's New Condenser ( Figs. 102 and 103) „ 623 



Glass Frog-plate (Fig. lOi) „ 623 



Groves and Cash's Frog-trough for Microscopical and 



Physiological Observations (Fig. 105) „ 624 



Visibility of Ruled Lines .. .. ^ „ 625 



