( 4 )■ 



Summary of Current Kesearches, &c. — continued. 



PAGS 



Batrachospermum 544 



New Beggiatoa 544 



Vampyrella 544 



Schizophycese .. .. .. .. 545 



Motion of Diatoms , .. 546 



Microscopy. 



Lossner's Tele-microscope .. 547 



PrazmowsMs Micrometer Microscope, (Fig. 91) 547 



Simplified Beading Microscope for horizontal and vertical circles . . . . 548 



Swift's Tank Microscope (Fig. 92) 549 



Teasdale's Field Naturalist's Microscope (Figs. 93 and 94) .. .. .. .. 549 



Steinheil's Achromatic Eye-pieces (Figs. 95 and 96) ... 551 



New Combination for Objectives -.. . 551 



Fluid for Homogeneous Immersion 551 



Shurley's Improved Slide for the Examination of Gaseous Matter (Fig. 97) 551 



Hardy's Compressorium (Fig. 98) 553 



Bulloch's Diatom Stage .. .. - 554 



Substage Fine-adjustment (Fig. 99) .. .. .. 554 



Sidle' s Centering Substage (Fig. 100) 555 



Mounting for the " Woodward " Prism (Figs. 101 and 102) 555 



Prisms versus the Hemispherical Lens as illuminators 556 



Badial Tail-pieces 557 



Electric Light in Microscopy (Figs. 103 and 104) . . .. .. 557 



Black Backgrounds .. .. 559 



Micrometrical Measurement by means of Optical Images 559 



Malassez's Improved Compte-globules (Figs. 105-108) 559 



Cutting and Mounting Microscopical Sections . . . . . . 567 



Preparing Blastoderm of the Chick 570 



Preparing Embryos of Insects . . . . 570 



Collecting, Staining, and Photographing Bacteria .. 571 



Ehrlich's Method of Exhibiting the Bacteria of Tuberculosis .. .. .. 572 



Preserving Infusoria and Ammbse 574r 



Preserving Protozoa 575 



Staining the Nucleus of Living Infusoria 576 



Double Staining with Carmine and Anilin Green 576 



Cutting Sections of Coal .. .. .. 577 



Sections of Mica-schist 578 



Paper Cells 578 



Wax Cells .. 578 



Miller's Caoutchouc Cement . . . . , . 579 



Mounting in Phosplwrus , .. .. 579 



Vacuum-bubbles in Canada Balsam 581 



Mounting Moist Objects in Balsam 582 



Moisture in Dry Mounts 583 



Dammar Varnish .. 583 



Cleaning Used Slides and Covers • • 583 



Besolution of Amphipleura pellucida 584 



Microscopic Examination of Wheat-flour 584 



Destruction of Microscopical Organisms in Potable Water 585 



Public Lectures in Microscopy .. .. 585 



Proceedings of the Society 589 



