CONTENTS. XXXVll 



PAGE 



Nelson, E. M. — Keeping both Eyes open in Observation Part 5 881 



A.-p-ERTV'KE Puzzles (^Figs. 21^ and 21^) , 882 



The ' TnviES ' on the Microscope „ 883 



Banes, C. W. — Electric Spark under the Microscope „ 888 



HiPPiSLEY, J. — A Pocket Field Microscope — Water and Melted Glass 



Lenses ,, 890 



'Refairi-ng Nicol Prisms „ 891 



Aheens, C. D. — Improved Form of Stephenson's Binocular Prism (Figs. 



220 and 22V) Part 6 959 



GiLTAY, E. — Remarks on Prof. Abbe's " Note on the proper Definition of 

 the Amplifying Power of a Lens or Lens-system " (Figs. 222 and 



223) „ 960 



Obisp, Feank — Limits of Resolution in the Microscope (Figs. 224-8) . . „ 968 



D'Aksonval's Water Microscope (Figs. 229-231) „ 1054 



Amyot, T. E. — Direct Vision Microscopes „ 1056 



Ulmee, J. — Microscope with Cedguf Focusing Adjustment (Fig. 2^2) .. „ 1057 



Iso&tb.ksze'wf's, Double Microscope „ 1058 



'M.ic-RO^CO-p-E.S unth Accessory Stages (Fig. 22^) ,, 1058 



Eiddell's (J. L.) Binocular Compound Microscoj)e (Figs. 234 and 235) „ 1059 



EocHER, B. DU — Megaloscopy „ 1061 



WATSOifi's Svjinging Substage Microscope (Fig. 236) „ 1062 



„ Camera or Lante7-n Microscope (Fig. 237) „ 1064 



Leckenby's Microscope Pencil-case „ 1065 



Malcolm, E. D. — Adjusting the Eye-pieces of Binoculars to eyes of 



unequal focal length „ 1065 



Geunow, J. — Abbe Condenser (Fig. 238) „ 1065 



Smith, H. L. — Device for Testing Refractive Index (Fig, 23d) ,. .. „ 1066 



QxJEEN, J. W. — Table of Colour- Correct io)is „ 1068 



J oly's (J.) Meldometer (Figs. 2i0 and 24:1) „ 1068 



SiOKES-WATSOirf Elect)-ic Spark Appai-atus (Fig. 24:2) „ 1069 



Hitchcock, E. — Optical Ar?'angements for Photo-micrography, and 



Remarks on Magnification ,, 1070 



Cox, J. D. — Actinic and Visual Foci in Photo-micrography with High 



Powers „ 1070 



Nelson, E. M. — Images in the Binocular Microscope (Figs. 243-248) .. „ 1073 



„ „ Position of Objects loith the Binocular ,, 1074 



WlCROSCOFES at tJie Inventions Exhibition ,, 1076 



Swift, M. J. — Photo-micrograph of To7igue of Blow-fly „ 1077 



CoNNOE, E. — Pen-and-ink Drawings of Microscopic Objects ,, 1077 



Supposed Increase of the Aperture of an Objective by using highly Refrac- 

 tive Media „ 1077 



Banks, C. W. — Electricity under the Microscope .. „ 1079 



'Ql.AGKY&G, Brass Diaphragms., ^c „ 1079 



Hyde, H. C. — The Electric Light in Microscopy „ 1080 



SivnTH, H. L. — The Influence of Science Studies „ 1081 



W., E. D. — Measurement of Power and Aperture of Microscopic 



Objectives .. .. „ 1082 



Waed, E. H. — Choice of Objectives and Oculars „ 1082 



~RoBiyi,G.— Death of „ 1118 



Oaepentee, W. B.— Deai/i 0/ , 1119 



