CONTENTS. XXXV11 



Siedentopf, H. — Ultra-microscopic Image 515 



„ „ Aplanatic or Gardioid Condenser for Dark-ground Illumination 



(Figs. 71, 72) 515 



Tafner, H. — Drawing on a Transparent Drawing-surface 517 



Brocher, F. — Drawing with the Camera-lucida (Fig. 90) 651 



Ignatowski, W. von — New Nicolfor Projection Purposes (Fig. 91) 652 



Siedentopf, H. — Allotropic Conversion of Phosphorus in the Cardioid Ultramicro- 



scope 653 



„ „ Recent Progress in Ultramicroscopy (Fig. 92) 654 



Sagnac, G. — Interferometer, with Inverse Superposed Luminous Rays, giving in 

 White Polarised Light a Narrow Central Fringe of Sensible Tint and Narrow 



Coloured Fringes at White Intervals ( Fig. 93) 654 



Bibliography 655 



Georgi, W. — Measuring Inclination of Abbe's Drawing Apparatus 761 



Ignatowsky, W. von — Improvements in the Leitz Mirror Condenser (PI. XV. and 



Figs. 107-9) .. .. 761 



Anderson, J. A. — Glass and Metallic Replicas of Gratings (Figs. 110, 111) .. .. 763 



Barns, C. — Use of the Grating in Interferometry 764 



Jones, R. F. — Dark-ground Illumination with High Power 764 



Bibliography .. ' 765 



(4) Photomicrography. 



Perkins, E. G. — Cheap non-vibrating Suspension for Microphotography 99 



Mees, C. E. Kenneth — Resolving Power of Photographic Plates 99 



Comandon, J. — Ultramicroscopic Cinematography of Living Microbes and of Moving 



Particles (Plate II.) .. 100 



Bibliography 100 



Banfield, A. C. — Method of Preparing Stereo-photomicrographs, PI. III. (Fig. 31) 



and PI. IV. (Fig. 32) 233 



Eeid, Duncan J. — Method of Estimating the Exposure in Photomicrography, ivith 



Axial Cone Illumination 369 



Bibliography 517 



Jullien, J. — Practical Photomicrography (Fig. 94) 656 



Nelson, E. M. — Grayson's Photomicrographs of his Rulings (Plate XIV.) .. . . 701 



Wunderek, H. — Printing on Sensitized Papers , 765 



Franz. V. — Photography with Ultra-violet Light 766 



Bibliography , .. .. 7t>6 



(5) Microscopical Optics and Manipulation. 



Merlin. A. A. C. Eliot — On the Measurement of Grayson's Ten-band Plate . . 5 

 Babrett, W. F. — Methods of Determining the Amount of Light Scattered from 



Rough Surfaces (Figs. 13-15) .. 101 



Barus, C. — An Adjustment for the Plane Grating similar to Rowland's Method for 



the Concave Grating (Fig. 16) 105 



Tutton, A. E. H. — Wave-length Comparator for Sta7idards of Length . .. 107 

 „ .. Use of Wave-length Rulings as Defining Lines on Standards of 



Length 107 



Bpbliography 108 



Merlin. A. A. C. Eliot — On the Measurement of the First Nine Groups of Grayson's 



Finest Twelve-band Plate 144 



Nelson. E. M. — On the Visibility of the Tertiaries of Coscinodiscus asteromphalus in 



a Balsam Mount 147 



Tutton, A. E. — Standard Measurement in Wave-length* of Light (Fig. 33) .. .. 2tS5 



Grayson, Henky J. — On the Production of Micrometric and Diffraction Rulings .. 239 

 Dec< imbe. M. L. — Measurement of the Refraction Index of Liquids by the Microscope 



(Fig. 34) .. 243 



Mennell, F. P.— Pleochroic Ualos 243 



Nelson, E. M.— Critical Microscopy (Fig. 46) 282 



Merlin, A. A. C. Eliot — On the Measurement of the Diameter of the Flagella of 



the Cholera Bacillus prepared by Loffler's Method 290 



