CONTENTS. 



TRANSACTIONS OF THE SOCIETY. 



PAGE 



I. — The Use of a Top Stop for Developing Latent Powers of the Microscope. 



By J. W. Gordon. (Platf s I. to III., and Figs. 1 and 2j 1 



II. — Microscopic Study of Strain in Metals. By F. Rogers. (Plates IV. and V.) 14 



III. — The President's Address: The Flowering Plants of the Mesozoic Age, in 

 tlie Light of Recent Discoveries. By Dukinfield H. Scott, M.A., 

 LL.D., F.R.S. (Plates VL to IX.) 129 



IV. — Mycetozoa. Cornuvia Serpula, a Species new to Britain. By Jos. M. Coon. 



(Plates X. and XI.) 142 



v.— An Earlv Criticism of the Abbe Theory. By J. W. Gordon. 



(Plates XIL and XIII.) 265 



VI. — Some Tardigrada of the Sikkim Himalaya, Bv James Murray. 



(Plate XIV.) * ,. 269 



VII- — On Some Rhizopods from the Sikkim Himalaya. By Eugene Penard, 



Docteur es-sciences (Geneve). (Plate XIV.) 274 



VIII. — Notes on a Peculiar Habitat of a Chlorophyte, Myxonema tenue. By 



A. D. Hardy, F.L.S., F.R.M.S 279 



IX.— An Improved Vertical Illuminator. By Edward M. Nelson. (Figs. 49, 50.) 282 



X.— On the Podura Scale. By Edward M. Nelson. (Plate XVI.) -. .. 393 



XI. — Diffraction Rings due to a Circular Aperture. By Alfred W. Porter, B.Sc. 

 Fellow and Assistant Professor of Physics, University College, 

 London ; and P. F. Everitt 405 



XII. — Some South African Tardigrada. By James Murray. (Plates XVII. 



and XVIIL) 515 



XIII.— Eye-pieces for the Microscope. By Edward M. Nelson. (Fig. 86).. .. 525 



XIV. — Note on a New Prismatic Microscope Ocular. By A. A. 0. Eliot Merlin. 



(Fig. 107) .. '. 643 



XV. — On Ghost Images seen in the Secondaries of Coscinodiscus aster omphalus, 

 with some Remarks on the Highest Useful Ratio of Magnifying 

 Power to Aperture. By A. A. C. Eliot Merlin 646 



XVI. — Systematic Exposure with Transmitted Light in Photomicrography. By 



Alfred Letherby 651 



XVII.— A New Semi-apochromatic |. By Edward M. Nelson. (Fig. 108) .. 656 



NOTE. 

 An Astronomical Eye-piece used as a Simple Microscope. By E. M. Nelson. .. 284 



OBITUARY. 

 Siegfried Czapski 407 



