CONTENTS. 
XXXI 
PAGE 
Dallinger, W. H. — Swift's Mechanical Stage 537 
Beck’s (R. & J.) Large “ Continental ” Model Microscope (Fig. 55) 615 
Koristka’s Microscopes (Figs. 56-59) 616 
Swift, J . — Practical Instructions for Making a Student's Microscope (Figs. 60-66) 620 
Ross & Co.’s “ Eclipse” Microscopes (Figs. 81-83) 734 
Coutant, R. B . — Support for the Microscope (Figs. 84-87) 737 
Watson’s Grand Model Van Heurch Microscope 761 
Swift’s New Mechanical Stage 768 
Zeiss’s New Mechanical Stage 768 
Nelson, E. M. — Zenimayer's Portable Microscope 771 
(2) Eye-pieces and Objectives. 
Steinheil, R . — New Objective Setting (Figs. 42 and 43) 509 
Michels, J . — Spencer & Smith's New 1/5 Objective 737 
Amann, J . — Koristka Semi-Apochromatic 1/15 Objective 737 
(3) Illuminating- and other Apparatus- 
Guglielmo, G . — New Exact and Easily Constructed Spherometer (Fig. 5) .. .. 107 
Nelson, E. M . — Chimney for a Microscope Lamp (Fig. 6) 108 
Leitz’s Micrometer Screw Adjustment (Fig. 7) 109 
Schroeder, Hugo — Production of Exact Micrometer- Screws (Figs. 19-21) .. .. 252 
Nelson, E. M. — Construction of Silvered Lens Mirrors (Fig. 22) 254 
Lafar, F . — Counting Apparatus specially adapted for Petri's Capsules (Fig. 28) .. 393 
Hearson’s Biological Incubators (Figs. 44-47) 511 
Reichenbach, H. — Incubator for any Source of Heat 
Koristka — Camera Lucida after Nachet (Fig. 67) 623 
Clay Wick for Microscope Lamps 
Magnifier for Reading Small Print 739 
Crova — The New Photometry 739 
Kruss, H . — Colorimeter with Lummer-Brodhun Prism Pair (Figs. 88 and 89) . . 740 
Nelson, E. M . — New Reflecting Camera Lucida 771 
(4) Photomicrography. 
Leitz’s Photomicrographic Apparatus (Fig. 8) 109 
Marktanner-Turneretscher, G. — On Instantaneous Photomicrography (Fig. 9) .. HO 
Zoth, O . — On the Cooling of Projection Preparations (Fig. 10) 112 
Monpillard — Orthochromatism applied to. Photomicrography 313 
Kohler, A . — New Method of Illumination for Photomicrography (Fig. 23) . .. 261 
Borden, W. C . — Stereoscopic Photomicrography 262 
Cunningham, K. M . — Remarkable Collection of Photomicrographs 262 
Atkinson, G. F . — Photographing Plate Cultivations 263 
Neuhauss, R . — Photomicrography and Projection 393 
Engel, S . — Simple Photomicrographic Camera 393 
Hansemann — Stereoscopic Photomicrography , 393 
Karq, K . — Photomicrograms for Purposes of Instruction 394 
Nelson, E. M . — Hints on Photomicrography 
Ccrties, C. L . — Apparatus for Obtaining Instantaneous Photomicrographs (Fig. 48) 516 
Baker’s Photographic Microscope (Fig. 49) 527 
Lemardeley’s Photographic Microscope 
Koristka Photomicrographic Cameras (Figs. 68-70) 623 
Neuhauss, R. — Comparison between Petroleum, Gas, and the Auer Incandescent 
Light with respect to their Usefulness for Photomicrographic Work . . . . 627 
Neuhauss — Photomicrograms of ice and Snow Crystals 741 
Vogel — The Optics of Photography 
(5) Microscopical Optics and Manipulation. 
Weber, L. — Chromatic Aberration of Lenses (Fig. 11) 
Strehl, K . — Theoretical Limit to the Capacity of the Microscope ** 263 
Piffard, H. G . — Increasing the N.A. of Immersion Lenses 286 
Tutton, A. E . — An Instrument for producing Monochromatic Light of any desired 
Wave-length, and its Use in Investigation of Optical Properties of Crystals 394 
Fock, A. — The Limits of the Visible 395 
