X 
CONTENTS. 
PAGE 
Cover Adjustment for Microscopic Objectives. {Woodcut.') .. .. 251 
The American Alicroscopical Congress 253 
Unit of Alicrometry ” 254 
A New Cestoid Host 254 
On the supposed Radiolarians and Diatotnacea; of the Coal-measures 255 
Preservation of Planaria 256 
“ Commercial Microscopy ” 257 
Physiology of the Contractile Vacuoles of the Infusoria . . . . 257 
White of Egg as an Imbedding Substance 258 
New American Journal of Microscopy 259 
Anaerobiosis of Micro-Organisms 259 
Haliphysema Tumanoiciczii, not a Sponge 261 
'The Embruoloqy of Sponges 263 
Osmic Acid 264 
The “ Transporter ” of Professor Monnier 265 
Fungus of the AJaple {Bhytisma acerinum) 265 
The Reproduction of Hydra 267 
llie Staining and Preparation of Bacteria 268 
A Mineralogical Microscope 270 
Alcoholic Fermentation .. 270 
Ditto ditto 270 
The Structure of the Brain in different Orders of Insects .. .. 271 
The Movement of Microscopic Particles suspended in Liquids .. 272 
'The Preparation of Thin Sections of Objects of different Consistency 274 
Measurement of the Dihedral Angles of Microscopic Crystals .. 274 
The Microscope applied to the Phenomena of Double Refraction .. 276 
The Causes of Buzzing in Insects 276 
The Septicity of Putrefied Blood 279 
Escape of Small Animals from Aquaria 280 
A New Form of Micrometer 280 
The Nutrition of Insects 281 
Parasites on a Diatom 281 
Mode of Development of the Tentacles in Hydra 282 
Fluid Mounting 283 
Influence of Temperature on the Optical Constants of Glass , . . . 283 
Protecting Cap for Focussing under Water 283 
The Optic Rod in the Crustacea and Annelida 284 
The Minute Structure of Stromatopora and its Allies 285 
The Compound Microscope applied to the Examination of Electric 
Discharge in Gases 287 
Marine Excursion of the Birmingham Microscopical Society .. .. 287 
Parasites of the Spongida 288 
A New Double Staining 289 
The Ordinary Microscope as a Polariscope for Convergent Light . . 292 
New Aerobic Vibrion 292 
The Projection of Microscope Photographsl' {Woodcut.) .. 294 
Cleaning Slides and Cover-glasses 295 
Miniature Microscope. { Woodcut.) 296 
Notommata Werneckii — a Parasite of Voucher ia .. 296 
“ Bismarck Brown ” as a Staining Material 297 
Thin Covering Glass 298 
