( 4 ) 



SuMMABT OP Cdbbent Eesbaeohes, &c. — Continued, _ 



New Diatoms 931j 



Fossil Diatoms 931; 



Periodical and Massive Appearance of Diatoms 931< 



Homeocladia and Schizo7iema 931 1 



I 



MiCBOSCOPT. 



Descriptions of New Microscopes .. .. 93^ 



Lacaze-Duthiers^ Aquarium Microscope (Boss Tank Microscope) (Figs. 203 



and 204) 932 



NacJiefs Petrographical Microscope (Figs. 205 and 206) 934- 



MiUer's Microficope icith Telescopic Eye-piece 935 



Sallys Pocket Microscope (^Swift-Brown Pocket Microscope) (Figs. 207-209) 936^ 



Sidle's" Acme" Lithohgical Microscope (Fig, 210) 93T 



Browning's Platyscopic Lenses .. .. 939 



Nachet's Porte-loupe (Fig. 211) ' 9331 



Lacaze-DiUMers' Porte-loupe (Fig. 212) , .. .. 939 



Zeiss' s Camera Lucida (Figs. 213 and 21 i) 940 



Tighlmann's Cylinder-Diaphragms for the Vertical lUuminator (Figs. 215- 



218) 941 



New Homogeneous-immersion l-12-i7ich of l'i3 N. A. .. .. 942 



Fluid for Homogeneous Immersion 942 



Beck's Glass Friction-stage (Figs. 219 and 220) 943 



ToUess Mechanical Stage (Figa. 221-223) 944 



Goodwin's Growing-slide (Fig. 224:) 946 



Diaphragms for Axial Condensers (Fig. 225) 947 



New Dioptrical Formula '. 94T 



Refractive Indices of Optical Glass .. .. .. .. ., 949 



Fine Rulings 949 



Koch's New MetJiod of Pure Cultivation of Bacteria 950 



Sterilization of Animal and Vegetable Liquids . . 952 



Hardening the Spinal Cord 95^ 



Transferring Sections from Alcohol to another Fluid .. .. 953 



Imlyedding in Paraffin and Freeing the Sections 953 



Imbedding in Paraffin .. .. 954i 



Taylor's Freezing Microtome 954' 



Waller's Section-knife for large Sections (Fig. 226) 954f' 



Staining of Living Unicellular Organisms 95Q 



Klein's Cochineal Fluid 956 



Purpurine for Staining Foetal Vertebrae .. 957 



Cements and Cementing .. .. ,. .. 95T 



Preserving Cover-glasses (Fig. 227) .. 95^ 



Sidle's ''Congress'" Turntable (Figs. 228 and 229) 953^ 



New Process for Preparing the Brain 96ft 



Action of Concentrated Osmic Acid on Bone-cells 960 



Mounting Chick Embryos whole , 961 



Mounting Echinoderm-larvse -. 96^ 



Mounting Class .. 962 



Mode of detecting Adulterations in Flour by the Microscope 962 



Reagent for small Quantities of Oxygen from Living Organisms 962 



Micro-photography •. ,. 964 



Histology and Microscopy 964 



Microscopy in 1830-1881 97C 



Obituary. M. Nachet, Sen,, and Mr. C. A, Spencer .. 97(1 



Pbooeedings op the Society 97S 



