XXViii CONTENTS. 



PAGB 



Beck — Dark-ground Illuminator (Fig. 60) 422 



Strzyzowski, C. — Practical Object-holder for the Microscopical Examination and 



Demonstration of Mobile Objects (Test-tubes, Capillary -tubes, etc.) 526 



'LmTz^'E.— Electrical Object-stage (Fig. 74c) 527 



Wolff, M., & E. WTCHaRAM — New Geiger Microscope Lamp 527 



Baker, C. — New Low-power Condenser 528 



Uabie, F.— The Lnsectoscope (Figa. 89-91) 627 



(4) Photomicrography. 



Bibliography 105 



Wellheui,F. R. Y.— Stereography 528 



(5) Microscopical Optics and Manipulation. 



Daniel, M,, and others — Photolysis of various Complex Sugars {Bioses and 



Triases) by the Ultra-violet Rays 105 



Button, E. A. — Belation of Aperture to Power in the Microscope Objective . . . . 208 



Smith, T, F. — Relation of Aperture to Power 209 



NiEMAN, C. W. — Power of a Microscope (Fig. 20) 210 



CoNRADY, A. E. — Dark-ground Illumination 210 



Wright, F. E. — Oblique Illumination in Petrographic Microscope Work .. .. 211 

 „ „ Index Ellipsoid {Optical Indicatrix) in Petrographic Microscope 



Work 212 



Merwin, H. E. — Media of High Refraction for Refractive Index Determinations 

 with the Microscope ; also a set of Permanent Standard Media 



of Lower Refraction 212 



Percival, a. S., & E. IjEItz— Resolving Power of the Microscope 213 



CoKER, E. G. — Application of Optical Methods to Technical Problems of Stress Dis- 

 tribution (Figa. 46, 47) 325 



Joly, J. — Method of Microscopic Measurement (Fig. 4S) 327 



Esclangon, E. — Method of obtaining Microscopical Bench-marks exactly Circular 

 in Micrometric Observations: Application to the Study of 



Trunnions in Equatorial Telescopes 528 



AiJuahiE, 'M.. A.— Measurement of Magnifying Power 528 



GonDOHf, J. W. ^Diffraction Bands.. 530 



C6") Miscellaneous. 



HayehSauIjI Hasmatocytometer 105 



B.EATH, 0. K.— The Beginner's Guide to the Microscope 106 



Bibliography 106 



QUEKETT Microscopical Club 213 



Qtjekett Microscopical Cltib 327 



QuEKETT Microscopical Club 423 



Nelson, E. M.—iVo<e on P/ewrosigma an^uZa^wm 530 



ZBOHmnEE, F.— Fluor- Crown, a New Optical Glass 531 



Nelson, E. M.— Microscope Construction and the Side Screw Fine-adjustment 



(Figs. 75, 76) 531 



QvEKETT Microscopical Club 630 



Bibliography 631 



