CONTENTS. XXl 



PAGE 



Polarizer for the Microscope ' No. 1 87 



Microscopical Injection of Molluscs ,> 9i 



Microscopy at the American, Association for the Advancement 



of Science ,■, 95 



Picro-carmine for Cell-nuclei No. 2 138 



Colonel Woodward on the Oil-Immersion Objectives and the 



Apertometer „ 140 



Diffraction Experiments with Pleurosigma angulatum .. „ 141 

 Employment of Mixtures of Chromic and Osmic Acids for 



Histological Purposes „ 144 



Microscopical Research under Difficulties „ 145 



Removal of Air from Microscopic Specimens „ 150 



Immersion Illuminators „ 151 



Unit of Micrometry „ 154 



The " Micro-Megascope " „ 160 



Another Method of Staining „ 163 



Size of Society Screv: and of Slides „ 163 



Staining for Fungi „ 170 



Achromatic Lenses „ 173 



Preparation of Microscopic AqvMic Anim/xls , 180 



The Postal Microscopical Society „ 180 



TTie Use and Abuse of Diatoms as Test Objects „ 183 



Measurement of the Amplification of Optical Instruments .. „ 184 



Support for the Head in Drawing idth the Camera Lucida .. „ 187 



Deceptive Appearances produced by Reagents ,, 191 



Preparation of Red Blood-corpuscles „ 191 



Apparatus for determining the Angle of the Optic Axes of 



Crystals with the Microscope. (2 figs.) „ 191 



Artificial Crystals of Gold. (1 fig.) >, 193 



The Vertical Illuminator „ 194 



Microscopes uith Swinging Tailpiece, {l fig.) No. 3 320 



" Penetration " of Wide-angled Objectives , 322 



Process for Measuring the Solid Angles of Microscopic 



Crystals „ 323 



Method of Isolating the Connective- Tissue Bundles of the 



Skin „ 323 



Process for Preparing the Embryos of Fishes „ 325 



Impi-ovement in Aerating Apparatus of Sea-water Aquaria „ 326 

 Fwther Improvements in studying the Optical Characters of 



Minerals „ 326 



Improved Achromatic Condenser 328 



Seiler's Mechanical Microtome. (1 fig.) „ 328 



Size of Histological Preparations „ 329 



'^ Microscopy " and '■^ Microscopical" Societies „ 329 



Oil-Immersion Objectives ,, 331 



Method of Preserving Infusoria, 4'C „ 331 



Mixture of Oils for Homogeneous-Immersion Objectives . . „ 332 



New Fluids for Homogeneous Immersion „ 332 



Standard Micrometers „ 332 



Unit of Micrometry „ 332 



Employment of Wet Collodion for Microscopic Sections . . No. 4 4G0 



VOL. II. C 



