xxvi CONTENTS. 



PAGE 



937 



Floating Eivulariece Part 6 



Sphacelaria jj °37 



" Sewage Fungus " » 937 



Growth of the Thallus of Coleochcete scutata ,, 937 



Influence of Graoitation on the Movements of Chlainy- 



domonas and Euglena ^i 938 



Chytridiacece u 938 



Cooke's Fresh-water Algce » 939 



Algce in Solutions of Magnesia and of Lime „ 939 



Confusion between Species of Grammatophora „ 939 



Depth at which Marine Diatoms can exist „ 939 



Diatoms of Franz-Josef s Land „ 940 



Structure of Diatoms from Jutland " Cement Stone " . . . . „ 940 



Structure of the Diatom Shell „ 943 



MICROSCOPY. 



a. Instruments, Accessories, &c. 



On the Mode of Vision with Objectives of Wide Aperture 



(Figs.1-7) Parti 20 



^^ Giant Electric Microscope " „ 109 



Aylward^s Rotating and Swinging Tail-piece Microscope 



{Fig. 2.) „ 110 



McLaren's Microscope, with Rotating Foot {Fig. d) .. .. „ 111 

 Schieck's Revolver School and Drawing-room Microscope. — 

 Winter's and Harris's Revolver Microscopes {Figs. 10 a 



and Band 11) „ 112 



WinkcVs large Drawing Apparatus {Fig. 12) „ 115 



Jung's New Drawing Appa>-atus {Embryograph) for low 



poicers {Figs. 13 and li) „ 116 



Zeiss' s 21icrometer Eye-piece {Fig. lb) „ 118 



Bulloch's Objective Attachment {Figs. IQ and 11) .. ., ,, 118 



Abbe's Camera Lucida {Fig. IS) „ 119 



Millar's Multiple Stage-plate {Fig. 19) „ 120 



Stewart's Safety Stage-plate {Fig. 20) ,. „ 120 



Parsons' Current Slide {Figs. 21 and 22) „ 121 



Stokes's Growing Cell {Ftg. 23) „ 122 



Nunn' s Pillar and other Slides „ 123 



Beckys Condenser with two Diuphrajm Plates {Fig. 24) . . „ 124 



Nelson's Microscope Lamp {Fig. 2?>) „ 125 



Developing Photo-micrographs „ 126 



Action of a Diamond in Ruling Lines upon Glass .. . . „ 126 

 Test Diatoms in Phosphorus and Monobromide of Naphtha- 

 line „ 138 



Microscopic Test- Objects {Fig. 2iS) „ 139 



Resolution of Amphipleura pellucida by Central Light .. „ 143 

 Bausch and Lomb Optical Co.'s '^ Investigator Improved" 



Microscope .. „ 144 



Stage Condenser for Diatomacew „ 144 



Bicentenary of Bacteria „ 144 



Drawing from the Microsc'pe ,. ,, „ 145 



