( 4 ) 



Summary of Cubrbnt Bbsearohbs, &c. — continued. 



PAQ8 



PitJiophora .. .. 271 



Besting-spores of Algas 272 



Hybridism, in the Conjttgatae 273 



New Oenera of Chroococeacese and PalmellaceiB .. "., 273 



Chroolepus unibrinum .... .. 273 



Constant Production of Oxygen by the Action of Sunlight on Protoeoccua 



pluvialis .. .. .. 273 



Chromatophorea of Marine Diatoms . . . . 274 



Division of Synedra Ulna . . .. 275 



Arctic Diatoms .. 277 



Pelagic Diatoms of the Baltic 277 



Diatoms of Lake Bracciano • . 277 



MiCEOscopy. 



Ahrens^ 8 Erecting Microscope (Fig. 28) 278 



Bulloch's Improved'^ Biological" Microscope 279 



Cox's Microscope with Concentric Movements (Fig. 29) .... .. .. 279 



Geneva Company's Microscope (Figa. 30 and dl) 281 



"Giant Electric Microscope" ,. .. 282 



Tolles's Student's Microscope (Fig. 32) .... ,. 283 



Winter's, Harris's or Ruhergall's Revolver Microscopes .. 284 



Geneva Co.'s Nose-piece Adapters (Fig. 33) 284 



Zentmayer's Nose-piece (Fig. 34) 285 



TSrnebohm's Universal Stage Indicator . . . . 285 



Stohes's Fish-troti^h (Figs. 35 &ud 36) 286 



Nelson-Mayall Lamp (Fig. 37) .. .. 286 



Standard Micrometer Scale .. .. 287 



Microscopic Test-Objects (Figs. 3S&-Q.d 39) .. .. .. ,. 288 



Aperture and Besolution (Figs. iO 2iTid il) .. 2S9 



The Future of the Microscope ..' .. .. 291 



Webb's ' Optics without Mathematics * . . 300 



Preparing and Mounting Sections of Teeth and Bmie 304 



Expanding the Blow-fly's Tongv^e .. 304 



Perchloride of Iron as a reagent for Preserving Delicate Marine Animals 305 



Action of Tannin on Infusoria .. ., .. .. 305 



Preparing Fresh-water Ehizopoda ,. 306 



Arranging Diatoms 307 



Mounting Diatoms in Series .. .. .. .. .. 308 



Synoptical Preparation of Pulverulent Objects (Diatoms from Guano, Fossil 



Earths, &c.) (Fig. i2) .. .. .. .. .. .. .. .. .. .. 308 



Logwood Staining .. .. .. 310 



Staining with Huematoxylon .. .. .. 311 



Dry Injection Masses .. ^ 312 



Schering's Celloidin for Imbedding .. .. .. .. .. ...... i. 313 



Gage's Imbedding-mass Cup (Fig. 43) .. .. .. 314 



Gage and Smith's Section-flattener (Fig. a) .. 314 



Francotte's Section-flattener (Fig. 45) .. 315 



Employment of the Freezing Method in Histology , . 316 



Improved Method of Using the Freezing Microtome .. 316 



Mayer's Method of Fixing Sections .. .. .. 317 



Chim and Syrup Preserving Fluid 318 



Cutting Tissues soaked in Gum and Syrup Medium .. 318 



Gum Styrax as a Medium for Mounting Diatoms 318 



Mounting Medium of High Refractive Index.. .. .. 319 



Kingsley's Cabinet for Slides (Fig. 46) 320 



Pillsbury's Slide Cabinet (Fig. 41) .. .. .. .... 320 



Examining the Heads of Insects, Spiders, &c,, alive .. 321 



Examining Meat for Trichinae .. 321 



Bolton's Living Organisms 322 



Cole's Studies in Microscopical Science .. .. 322 



Peocebdinqs op the Society ., , .. .. 327 



