XXXVI CONTENTS. 



I'AOB 



Rolfe, (t. W., & C. Field — Some Notes on Laurent Polariscope Headings .. .. 224 



Bolfe, G. W. — Quartz-Plate Readings in Saccharimttry 224 



Mackinnet, V. H. — A New Spectrometer : its Uses and Advantages 224 



Beck, B. & J. — Optical Bench for Illumination with either Ordinary or Monochro- 

 matic Light (Fig. 32) .'. 225 



Coon, J. M.— New Finder for the Microscope (Figs. 40, 41) 274 



StcdniCka, F. K. — A New Application of the Abbe Condenser 364 



Gordon, J. W.— Post-Objective Slop (Fig. 46) 365 



Fabry, C, & H. Buisson — Use of the Cooper-Hewitt Lamp as a Source of Mono- 

 chromatic Light . . . . 365 



Bibliography 366 



Beck, C. — A Simple Wave-Length Spectroscope, made to the designs of E. M. 



Nelson and J. W. Gordon 418 



Zeiss' Centring Achromatic Condenser (Fig. 57) 492 



Sauve, A., & A. Nodon — Spectrohelioscope (A.Sauve). — New Arrangement for pro- 

 curing a Monochromatic Image of a Light-Source (A. Nodon) 492 



Kruss, P. — Spectroscope with Adjustable Dispersion (Figs. 58, 59) 493 



Bibliography .. .. 494 



Pohlman, A. C. — New Projection Drawing Board 601 



Leppin & Masche's Mirrormegascope (Figs. 67,68) 602 



Bender. O. — Simple Illuminating Apparatus for Loup Preparations and for 



Microscopy (Figs. 09, 70) 603 



Watson's Ball-bearing Sliding Bar (Fig. 79) 719 



Stolze— Simple Photometer (Fig. 80) 719 



Tswett's Luminoscope 719 



(4) Photomicrography. 



Moffat, E. — Portable Photomicrographio Camera (Fig. 12) 99 



Bibliography 100 



Rheinbekg, J. — Photomicrography with Ultra- Violet Light 117 



O'Donohoe, T. A. — Photography of Diatoms. (Plate VII.) 156 



Moffat. E. — Method for Deter mi ing the Exact Colour for Light Filters . . .. 226 

 Dollman, W. P. — A Simple Method of Producing Stereo- Photomicrographs. 



(Plate VIII.) .. .. 257 



Tavernek, H. — A Simple Method for Taking Stereo-Photomicrographs, and Mount- 

 ing the Prints without Cutting, (t'lates IX., X., XL, and Figs. 38, 39) .. 260 



Bheinberg, J. — Photomicrography with Ultra- Violet Light .. 391 



Ponsot, M. — Interferential Photography ; Variation of Incidence ; Polarised Light 604 

 Lewin, L., & others — Photography of the Absorption Rays of the Colouring Matters 



of Blood 605 



Dollman, W. P. — Production of Stereo-Photomicrographs 605 



Bibliography 608 



Lippmann, M. G. — Principles on which Direct Photography of Colours Depends; 



Direct Colour-Photography Depending on Prismatic Dispersion 720 



Bibliography 721 



(5) Microscopical Optics and Manipulation. 



Gordon, J. W. — Dark Field Illumination 157 



Havelock, T. H.— Artificial Double Refraction, due to Mlolropic Distribution, xuith 



Application to Colloidal Solutions and Magnetic Fields 226 



Bibliography 227 



Schneider, J., & J. Just — Ultramicroscopy of Oleosole .. 366 



Pauly, A. — A Simple Method for the Determination of the Refraction-Index of 



Liquids .. . . 367 



Sommerfeldt, E. — Microscopical Axial-angle Determination of very small Crystals 368 

 Siedentopf, H. — Ultramicroscopical Investigations upon the Colours of Rock Salt 



(Fig. 47) 368 



Croft, W. B. — Some Simple Questions on the Images of Microscopes and Telescopes 369 



Bibliography 370 



Meslin, G. — Interferences produced by a Network limiting a thin Lamella .. .. 494 



Barrett, W. F. — Entoptic Vision and Entoptiscope (Plate XVII.) 495 



Bibliography .. 496 



