XXXI V CONTENTS. 



PAGB 



Howe, L. — Imperfection of the Eye and Test Objects Parti 147 



Nelson, E. M. — Pygidium of the Flea as a Test Object , 147 



"Webb's (W.) Lord's Prayer , 147 



Leeuwenhoek MedaZ „ 148 



Beheens, "W. J. — Rules for the use of the Microscope „ 148 



Holmes, E. — A Simple and Handy Compound Selenite and Mica Stage ., „ 150 



Nelson, E. M. — Testing Objectives „ 151 



Wall, O. A. — Pinhole Microscopes „ 152 



„ „ Photo-micrographic Cameras „ 152 



Walmslet, W. H. — How to make Photo-micrographs „ 153 



Swift's Photo-micrograph of Tongue of Plow-fly „ 184 



Meecek's (A. C.) Photographs of inked surfaces covering pencil lines ., „ 185 



Elizabeth Thompson ^cierace i^wnc? „ 187 



"New Apertiire Table „ 187 



Zeiss's 1-in. Aplanatic Lens „ 188 



TjEGk's Petrological " Star " Microscope „ 189 



jy-RAPEB,, J. C, Death of , 190 



Fol's (H.) Travelling and Dissecting Microscope (^Figs. 45 and^S) .. Part 2 304 



Helmholtz's (H. L. p.) Vibration Microscopie {Fig. 47) „ 305 



Eeicheet's (0.) Stand with New Stage and Iris Diaphragm (Figs. 48-52) „ 307 

 Thoma's (B.) Microscope for observing the Circulation of the Blood 



{Fig. 53) „ 309 



^KTSO^'s Collector's Pocket Microscope {Fig. M) „ 311 



Barnes, C. E.. — Cheap Dissecting Microscope „ 311 



Waed, E. H. — Hand-rests {Figs. 55 and ftQ) „ 312 



Gtjndlach, E., & J. K. Stockwell — Astigmatic Eye-pieces , 313 



'M.M.AS^ET.'s {Jj.} Camera Lucida {Figs. 51 and 58') „ 314 



EwELL, M. D. — Relative merits of Filar and Ordinary Glass Eye-piece 



Micrometers „ 316 



T^E New Objectives „ 316 



Lebiedzinski, P. — Liquid Lenses „ 321 



'KoFiiST'KA^ S, Abbe Illuminator {Figs. 5d and QQ) „ 322 



Centeal V, Oblique Light „ 322 



Beeyooet, H. L. — Illumination by aid of Air-bubbles .. .. :. .. „ 324 



Nelson, E. M. — Campbell's Fine Adjustment {Fig. 61) „ 324 



Andeeson's Double-action Fine Adjustment {Fig. 62) „ 325 



Feitsch's (G.) Stage for Stereoscopic Photo-micrographs {Figs. 63 



andQi) „ 325 



Kellicott's (J. S.) Moist Chamber „ 326 



Beheens, W. — Klonne and Miiller's Bacteria- finder „ 327 



T£>7.SEB.'% {S.) Micro-refractometer {Figs. 65-Ql) „ 328 



LowNE, B. T. — Apparatus for Examining the Reflex in the Compound 



Eye of Insects „ 330 



T-elotuk's {^.) Frog-pAate {Fig. m) „ 330 



Thompson, F. C. — Easy Method of making Micro-photographs .. .. „ 331 



Holman, D. S. — Instantaneous Micro-photography „ 333 



Altmann, E. — " On the possibility of improvement in the Microscope " 



{Figs. 69 and 70) „ 333 



Castellarnau T DE Lleopaet, J. M. DE — The Aperture Question .. „ 335 

 Eead, H. T., & A. E. OuTERBEiDGE — Fine Platinum Wire and Thin 



Gold Leaves 336 



