CONTENTS. 



XXIX 



PAGE 



Zeiss's Camera Lucida. (Figs. 213 and 214) Part 6 940 



Ttghlmann's Cylinder-Diaphragms for the Vertical Illu- 

 minator. (Figs. 215-218) „ 941 



Nev: Homogeneous-Immersion 1-1.2-inch of 1'^^ N. A. .. ,, 942 



Fluid for Homogeneous Immersion ,, 942 



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



Tolles's Mechanical Stage. (Figs. 221-223) , 944 



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



Diaphragms for Axial Condensers. (Fig. 225) . . . . „ 947 



Hew Dioptrical Formula „ 947 



Befractive Indices of Optical Glass „ 949 



Standard Gauges for Eye-pieces and Substages „ 975 



Stagnation of the Microscope „ 975 



New Abbe Apertometer for measuring very large Apertures „ 978 



jS, Collecting, Mounting- and Examining' Objects, &c. 



Dr. Maddox's Modified Aeroconiscope. (Figs. 22 and 23) Part 1 134 

 Herpell's Method of Preparing Fungi for the Herbarium .. „ 136 

 Simple and Speedy Method of Staining Animal and Vege- 

 table Sections ,j 137 



Staining and Mounting Follen ^^ 137 



Dry Mounts for the Microscope „ 138 



Carbolic Acid in Mounting ^^ 139 



Wax Cells „ 139 



Simple Device for Handling Thin Covers „ 140 



Mounting Clip. (Fig. 2^) „ 141 



Arranging Diatoms, 4'C „ 141 



Mapping with the Micro-spectroscope ,, 145 



Tubes for Conveying Moist Specimens, Diatomxiceae, 4'c., by 



Post „ 145 



Glass Crystals. (Fig. 30) „ 146 



Aeroscopes Part 2 361 



Slip-cleaning Instrument ^^ 362 



The late F. A. Nobert „ 364 



Method for Colouring Infusoria and Anatomical Flem£nts 



during Life Part 3 527 



Double and Treble Staining 528 



Preserving Confervae and Desmids 530 



. Preserving Marine Algce 530 



Soap for Preparing and Cleaning Diatoms , 531 



Sullivant's Mechanical Fingers ^ 533 



Mounting with Glycerin-jelly 534 



Mounting Starches 535 



Mounting Desmids 53g 



Wax for Dry-mounting Opaque Objects , 536 



Wax Cells with White Zinc Cement for Fluid Mounts . . , 538 



How to make Wax Cells. (Figs. 130-133) 538 



Gutta-percha Cells 540 



Apertures in Opaque Mountings , 54O 



Copal Varnish 541 



