CONTENTS. 



XXI 



PAGE 



Relationship of Palmella to the Confervacece ., .. ,. Part 5 664 



Division of Closterium intermedium ~ .. ,, , 665 



Diatoms from the Island of Lewis .. .. „ 665 



{Composition -of Fucus amylaceus .. . . , . Part 6 834 



Mazcea, a new genus of Gryptophycem ., „ 835 



Mesting-spores of Conferva ., .. .. .. ., .. . . „ 836 



Diatoms of the Baltic „ 837 



Motion of Diatoms. {Figs. 147-149) . . „ 838 



-Symbiosis of Animals and Algce „ 839 



Vampyrella and its Allies ,. .. .. .. „ 840 



MICROSCOPY.* 



a. Instruments, Accessories, &&, 



White's New Growing or Circulation Slide (^Fig.V) .. .. Parti 19 



Symons' Hot or Cold Stage. (Fig, 2) .. .... .. „ 21 



"Goltzsch's Binocular Microscope, (^Figs. 3 and 4) . • . . „ 95 



Hartnack's Dem,onstration Microscope. {Fig. 5) . . . . „ 97 



Lacaze-Duthiers' Microscope with Rotating Foot. (Fig. 6) „ ^7 



Nachefs Portable Microscope. {Figs. 7-11) .. .. .. „ 98 



Farkes's " Drawing Eoom " Microscope .-. , . .^ . . „ 100 



Fiffard's Skin Microscope. (Fig. 12) . . . . . . . . „ 100 



BoUpJs Dissecting Microscope. (Fig. 13) „ 101 



Briicke Lens. (Figs. 14: and 15) ,, .. „ 101 



The Model Stand .. ., „ 102 



Denomination of Eye-pieces <md Standard Ganges for same „ 103 



Talk of Magnifying Powers .. ,. „ 105 



■Braham's Microgoniometer ,. .. . . , . . , . . . . „ 106 



Watson^ s Sliding-box Nose-piece (Figs. 16 and 17) .. .. „ 106 



Deby's Screw-Collar Adjustment, -(Fig. 18) .. .. -., „ 107 



Number of Lenses required in Achromatic Objectives . . „ 107 



Colour Corrections of Achromatic Objectives ., ., ,. ,, 109 



Verification -of Objectives .. ,. .. ., „ 109 



Schultze's Tadpole-Slide. (Fig. Id) ,. ., ., .. .. „ 110 



Stokes's Tadpole- Slide. (Fig, 20) „ 110 



*' Swinging Substage " or " Swinging Tail-piece " .. .. „ 111 



Value of Swinging Tail-pieces ,, 111 



Hanvier's Microscope-Lamp. (Fig. 21) „ 112 



Hollow Glass Sphere as a Condenser „ 112 



Stein's small Microphotographic Apparatus. (Fig, 22) .. „ 113 



Ea7ivier's My 0- Spectroscope. (Fig. 23) „ 113 



Standard for Micrometry .. „ 114 



Rogers' Micrometers. (Fig. 24) ,, 117 



Section of "Histology and Microscopy " at the American 



Association .. ., , „ 119 



Structure of Cotton Fibre ., „ 1T9 



President's Address Part 2 145 



" Acme" Class Microscope, (Fig, 29) „ 251 



* Papers and notes abstracted in tlie Bibliography are also included here. 



b 3 



