XXXVlll CONTENTS. 



PAGE 



Fran^ois-Franck, Ch.-A. — Photomicrography in Colour with Achromatic Plates of 



A. and L. Lumiere 629 



Bibliography 630 



Letherby, Alfred. — Systematic Exposure with Transmitted Light in Photo- 

 micrography 651 



(5) Microscopical Optics and Manipulation. 



Cotton, A., & H. Mouton — Ultramicroscopes : Ultramicroscopic Objects .. .. 103 

 Cesaro, G. — Study of the Rotation Impressed upon the Plane of Polarisation by the 



Lenses of the Microscope under Convergent Light 104: 



Maclatjrin, R. C. — Numerical Examination of the Optical Properties of Thin 



Metallic Plates 104 



Cesaro, G. — Colourless Lines produced by Convergent Light in Crystalline Laminx 104 



Bibliography 105 



Barrett. W. F. — Entoptic Vision 224 



Zeiss' Comparison Spectroscope for Colour Technology (Figs. 36, 37, 38) 225 



Zeiss' Hand Spectroscopes (Figa. 39, iO) 227 



BiLTZ, W. — Ultramicroscopic Observations: The Characterisation of Inorganic 



Colloids 228 



Conrady, a. E. — Iris of Optical Systems 229 



Eheinberg, Julius — On Stereoscopic Effect and a Suggested Improvemeid in Bin- 

 ocular Microscopes <Y\g. 'il) 229 



Gordon, J. W .—An Early Criticism of the Abbe Theory (Flat.is XII. ai d XIII.).. 265 



Uhler, H. S. — Absorption Spectra of the Anilin Dyes 371 



Milne, J. R. — A Simple Way of Obtaining the Half-shade Field in Polarimeters 371 



Bibliography 371 



PoRTEH, A. W., & Everitt, P. F. — Diffraction Rings due to a Circular Aperture 405 



Porter, Albert B. — On the Nature of Optical Images (Vig. 82) 486 



Bibliography 488 



Meyer, A. — Ultramicroscopic Studies on Certain Organic Colloids. Two Optic 



States of ( >rganie Colloids 630 



Cesaro, G. — jS'eio Method of Determining Indices of Refraction 630 



Siedentopf, H. — Direct Visibility of Neutral Layers in Bodies supposed to contain 



them 630 



Bibliography 631 



Merlin, A. A. C. E. — On Ghost Images seen in the Secondaries of Coscinodiscus 

 asteromphalus, tvith some Remarks on the Highest Useful Ratio of Magnifying 



Power to Aperture 646 



Fabry, C. — Polarisation of Refraction and Propagation of Light in a Medium 



Non-homogeneous 742 



Bibliography ■ 742 



(6) Miscellaneous. 



E.E.F.— Fluid Crystals 105 



QvEKEiT Microscopical Club ., 106 



Bibliography 107 



Scourfield, D. J. — Mendel ism and Microscopy 232 



QvEKETT Microscopical Club 233 



Ames, J. S. — Rowland' s Ruling Machines 371 



Adami, J. G., & L. AscHOFF — Fluid Crystals 371 



Quekett Microscopical Club 372 



Bibliography 372 



Nelson, E. M.— 0?j ffte Podjtra ^caZe (Plate XVI.) 393 



Matthews, J. Merritt — Textile Fibres 488 



Quekett Microscopical Club 488 



Schneider, J., & G. KrNZL — Textiles and Colours in the Ultramicroscope .. .. 631 



