( ^ ) 



Summary of Current Researches, &c. — continued. 



Origin of the Lowest Organisms 90 



Prolangcdion of Vegetative Activity of ChlorophyUian Cellg under the 



Influence of a Parasite 93 



Classification of Nostoc 93 



Diatoms of Thames Mud 94 



Microscopy. 



Goltzsch's Binocular MicroscoiJe (Figa. 3 and 4i) 95 



Hartna^k's Demonstration Microscope (^Fig. 5) 97 



Lacaze-Duthiers' Microscope with Botating Foot (Fig. 6) 97 



JSachel^s Portable Microscope {Figs. l-\\) 98 



Parhes's '^ Draicinq Room" Microscopic 100 



Pi fmrs Skin Microscope (Fig. 12) 100 



Robin's Dissecting Mi'-roscope (Fig. 13) 101 



5rMc7;e I-e»s (Figs, li and 15) 101 



The Model Stand 102 



. Denomination of Eye-pieces and Standard Gauges for same 103 



Braham's Microgoniometer 106 



Watson's Slidinq-box Nose-pieee (Figa. Hi and 17) 106 



Deby's Screw-Collar Ad^justment (Fig. 18) 107 



Number of Lenses required in Achromatic Objectives 107 



Colour Corrections of Achromatic Ohjedives 109 



Veriiication of Objectives 109 



Schultze^s Tadpole-Slide (Fig. 1^) 110 



StoTies's Tadpole-Slide (Fig. 20) 110 



"■ Swinging Substage" or '■'■ Stoinging Tail-piece" Ill 



Value of Swinging Tail-pieces Ill 



Ranvier's Microscope-Lamp (Fig. 21) .. ., ,. 112 



Holloio Glass Sphere as a Condenser 112 



Stein s small Microphotographio Apparatus (Fig. 22) 113 



Ranvier's Myo-Spectroscope (Fig. 23) 113 



Standard for Micrometry 114 



Rogers' Micrometers (Fig. 2i) 117 



Section of " Histology and Microscopy "at tJie American Association .. 119 



Structure of Cotton Fibre ..- 119 



Durable Preparations of Microscopical Organisms 120 



Preparing Anthers 122 



HerpeVs Method of Preparing Fungi for the Herbarium 122 



Dissociation of Gland-Elements 123 



Method of Preparing and 31ounting Soft Tissues .'. 123 



Preservation of Anatomical Specimens 124 



Barff's Preservative for Organic Substances 124 



Injection-mass 125 



Imbedding Delicate Organs 125 



Katsch's Large Microtome (Fig. 25) 126 



Cox's " Simple Section-cutter for Beginners" 126 



Cutting Sections of very Small Objects .. 126 



Mounting in Balsam 126 



Mounting in Glycerine 127 



Smith's Slides .. .. 127 



Spring aip Board (Fig. 26) 128 



Examination of Living Cartilage 128 



Statoblasts of Lophopus crystallinus as a Test for High-power Objectives. — 



Areolations of Isthmia nervosa 129 



Microscopical Structure of Malleable Metals 130 



Sections of Fossil Coniferous Woods . . 131 



Aeration of Laboratory Marine Aquaria (F'\g. 21) 131 



Proceedings op the Society 133 



