XXX 



CONTENTS. 



PAGE 



Bert rand'' s Polarizing Prism Part 6 965 



Electric Illumination for Anatomical^ Microscojncal, and 



Spectroscopical Work „ 966 



Clayton and Attout-Tailfer's Iscchromatic Plates for Photo- 

 micrography „ 969 



Error in Photographing Blood-corpuscles ,, 969 



The Tolles- Wenham Aperture Controversy ., 970 



Amphipleura pellucida resolved into " Beads." Nature of 



the Stria of Diatoms „ 971 



Making a Neutral-tint Camera Lucida „ 974 



" Which is the best Microscope ? " „ 974-5 



Photographing Diatoms and Diffraction Gratings . . . . „ 975 



Swift and 8o7i's new 1-in. Objective „ 976 



Blackground Illumination „ 976 



Cheap Microscope-holder „ 976 



Report of Deputation to the American Society of Micro- 

 scopists and the American Association for the Advance- 

 ment of Science ,, 995 



Death of Dr. J. J. Woodward ,, 997 



Cheyne's Biological Laboratory at the Health Exhibition .. ,, 1000 



Wright's Lantern Microscope „ 1006 



Collecting', Mounting and Examining Objects, &c. 



The Constituents of Sewage in the Mud of the Thames 



(Plates I.-ir.) Parti 1 



Mounting and Photographing Sections of Central Nervous 



System of Reptiles and Bntrachians „ 149 



Preparing Spermatozoa of the Newt „ 120 



Killing Hydj'oid Zoophytes and Polyzoa with the Tentacles 



extended „ 151 



Mounting Pollen as an Opaque Object „ 152 



Mounting Fluid for Algce „ 153 



Mounting Diatoms in Series ,, 153 



Registering Micrometer Screw to the Thoma-Microtome 



(Fig. 27) „ 153 



Mounting Entomological Slides „ 154 



Sets of Sections of Woods for Instruction in Schools , . ,, 155 



Staining Bacillus Tuberculosis „ 155 



Cutting Glass Circles .. .. „ 156 



Examination of Seminal Stains on Cloth „ 156 



Preservation of Museum Specimens „ 157 



Glycerine Mounting 157 



Peticolas' New Slides of Diatoms „ 158 



Improved Slide Box „ 158 



Thymol as a Polariscopic Object „ 158 



Stanley's Sta7idard Sections for Students „ 159 



Polariscope Objects ^^ 159 



Unpressed Mounting of the Tongue of the Blow-fly .. .. „ 160 



Cutting Sections of Diatoms , 166 



On the Mineral Cyprusite Part 2 186 



