CONTENTS. 



TRANSACTIONS OF TEE SOCIETY. 



PAQB 



I. — The Theory of Highly Magnified Images. By J. W. Gordon. (Figs. 1-24) 1 



II — The President's Address : What were the Carboniferous Ferns ? By 



Dukinfield H. Scott, F.R.S. (Plates I. to III. ; Figs. 32, 33) .. .. 137 



III. — Micro-Metallography with Practical Demonstration. By J. E. Stead, 



F.R.S. . .. 273 



IV — Methods for Detecting the more Highly Phospliorised Portions in Iron 



and Steel. By J. E. Stead, F.R.S. (Plates V. and VI.) 284 



V. — On the Application of the Undulatory Theory to Optical Problems. By 



A. E. Conrady, F.R.A.S., F.R.M.S. (Figs. 74-78) 401 



VI. — Theories of Microscopical Vision. (Second Paper.) By A. E. Conrady, 



. F.R.A.S., F.R.M.S. (Figs. 123-8) 541 



VII. — Notes on "Aragotite," a Rare California Mineral. By Henry G. Hanks .. 673 



NOTES. 



An Experimental Proof of Phase-Reversal in Diffraction-Spectra. By A. E. 



Conrady, F.R.A S., F.R.M.S 150 



The Influence on Images of Gratings of Phase-Differences amongst their Spectra. 



By Julius Rheinberg. (Plate IV.) 152 



The Tubercle Bacillus. By Edward M. Nelson. (Figs. 79-81) 412 



The Ashe-Finlayson " Comparascope." By D. Finlayson, F.L.S. (Fig. 82) . . 414 



An Optical Paradox. By Lord Rayleigh, O.M., F.R.S. (Fig. 83) 417 



New Hot Stage. By W. S. Lazarus-Barlow, M.D., F.R.C.P. (Plate VII., Fig. 84) 419 



The Movements of Diatoms and other Microscopic Plants. By Daniel D. Jackson 554 



On " An Optical Paradox." By Dr. G. Johnstone Stoney, F.R.S. (Fig. 129) .. 557 



The Optical Convention. (Figs. 130-7) 559 



Electrical Warm-Stage. By Cecil R. C. Lyster. (Plate VIII., Fig. 15S) .. .. 677 



OBITUABY. 



Ernst Abbe 156 



