x TABLE OF CONTENTS. 



GEOGBAPRY Continued, 



Asia Page 344 



Ni \v ( 1 1 ima 351 



( IRTOGRAPHY AT Tin: Irlm u EXHIBITION 352 



MICROSCOPY. By Professor Hamilton L. Smith, llobart College, Ge- 

 neva, N. Y 355 



Improvements in Microscopical Objectives and Microscopical 



Apparatus 355 



The Now Oil-immcrsiou Object-glass of Carl Zeiss 355 



Immersion Condensers 356 



A N\v ( over-adjustment for Microscopical Objectives 357 



Professor Abbe's Apertometer 3">7 



New Form of Micrometer 359 



New Test-object 359 



Self-centring Turn-table 3G0 



Theoretical Limit of Aperture 3G1 



Micro-organisms, Bacteria Germs, Sporls, etc 3G1 



Anaerobiosis of Micro-organisms 3(11 



Organisms Suspended in the Atmosphere 3G2 



Schulze's Mode of Intercepting the Germinal Matter of the Air. . . 3G3 



Action of very Low Temperatures on Bacteria 364 



Staining and Preparation of Bacteria 3G4 



Examining, Preserving, and Photographing Bacteria 3G5 



Measurement of the Diameter of the Flagella of Bacterium Pernio. 366 



Life History of a Minute Septic Organism 367 



Bacteria in Splenic Disease 367 



Infusoria, Diatoms, Radiolaria, etc 367 



Trembley's Experiments in Turning a Hydra Inside Out 367 



The Foraminifera and Polyeystina of the North Polar Expedition, 



1875-76 368 



Radiolaria 368 



Multiplication of Khizopods 368 



Supposed Radiolarians and Diatomacea; of the Coal-measures 369 



Revivification of Diatoms 369 



Parasites on a Diatom 370 



Diatoms in Colored Liquids 371 



Isthmia nervosa : a Study of its Modes of Growth and Reproduction . 371 



I [SSUE-STALNING, 1>looi>, etc 372 



Structure of the Colored Blood-corpuscles 372 



Rapid Staining by means of Carmine 374 



< mid-staining, and the Termination of the Nerves in the Unstriated 



Muscles 374 



Mix ill am.oi - 375 



Nt >w Arams 375 



Insect Dissection 375 



