CONTENTS. 



TRANSACTIONS OF THE SOCIETY. 



PAGE 



I. — A Reply to Professor Porter's and Mr. Everitt's Criticism upon rny Paper 



on the Resolving Power, etc. By Edward M. Nelson 1 



II. — On the Diffraction Rings for a Circular Opening ; and on the Limit of 

 Resolving Power. (Being a Rejoinder to Mr. Nelson.) By Alfred 

 W. Porter, B.Sc. (Fig. 1) ., 3 



III.— Mercury Globules as Test Objects for the Microscope. By J. W. Gordon. 



(Plate I. figs. 1, 2; and Figs. 2-6) 6 



IV.— Light Filters for Photomicrography. By E. Moffat. (Plate I. figs. 3-6) 20 



V.— Francis Watkins' Microscope. By Edward M. Nelson. (Figs. 26-29) .. 137 



VI. — Eye-pieces for the Microscope. By Edward M. Nelson 146 



VII. — A Correction for a Spectroscope. By Edward M. Nelson. (Fig. 30) .. 150 



VIII. — On Dimorphism in the Recent Foraminifer, Alveolina boscii Defr. sp. 

 By Frederick Chapman, A.L.S. F.R.M.S. (Plates II. and III. and 



(Fig. 31) 151 



IX.— Gregory and Wright's Microscope. By Edward M. Nelson (Fig. 32) .. 154 

 X. — Biddulphia mobiliensis. By Edward M. Nelson 158 



XI. — The President's Address : On Seeds, with Special Reference to British 

 Plants. By the Right Hon. Lord Avebury, P.O., D.C.L., F.R.S. 

 (Plate IV. and Figs. 67-85) 273 



XII. — On the Microscope as an Aid to the Study of Biology in Entomology, with 

 particular reference to the Food of Insects. By W. Wesche, F.R.M.S. 

 (Plates V. to X. and Figs. 114-118) 401 



XIII. — Illuminating Apparatus for the Microscope. By J. W. Gordon. (Figs. 



119-120) 425 



XIV. — Corethron criophilum Cast. By Edward M. Nelson 430 



XV. — On Cycloloculina, a new Generic Type of the Foraminifera. With a 

 Preliminary Study of the Foraminif erous Deposits and Shore-sands of 

 Selsey Bill. By Edward Heron-Allen, F.L.S. F.R.M.S., and Arthur 

 Earland. (Plate XII. ami Fig. 138) 529 



XVI. — On Dendritic Growths of Copper Oxide in Paper. By James Strachan. 



(Plate XIII.) 544 



XVII. — Some African Rotifers. By James Murray. (Plate XV.) 665 



XVIII. — On the Resolution of Periodic Structures. By Edward M. Nelson. 



(Fig. 157.) 671 



XIX.— An Auxiliary Illuminating Lens. By Edward M. Nelson. (Fig. 158.) 673 



XX. — Note on a Remarkable Alcyonarian, Studeria mirabilis g. et sp. n. By 



Professor J. Arthur Thomson. M.A. (Plate XVI.) 675 



XXL— The Present Status of Micrometry. By Marshall D. Ewell, M.D. 



Chicago 682 



