ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 891 



Lacaze-Dt:thiers, H. de.— Note accompagnant la presentation d'Appareils 



d'eclairage electrique pour les travaux des naturalistes, chimistes, micro- 



graphes, &c., construits par M. G. Trouve. (Electrical illuminating apparatus 



for naturalists, chemists, microscopists, &c., constructed by G. Trouve'.) 



[1. Glass jar with a silvered glass bottom and a silvered parabolic reflector 



over the mouth, having in the centre an incandescent lamp illuminating 



the interior of the jar. 2. Modified apparatus for fermentations. 



3. Modified He'lot and Trouve' electric photophore.] 



Comptes Rendus, CI. (1885) pp. 405-7 (1 fig.). 

 Lewis, R. T.— Electricity in the Microscope. [-S"/jra, p. 875.] 



' Engl. Meoh., XLII. (1885) p. 19. 



Malcolm— On Binocular Glasses adjustable to eyes having unequal focal 

 lengths. iPost.-] Froc. Phys. Soc. Lond., VII. (1885) pp. 80-1. 



M ' C o N N E L, J. C— Notes on the use of Nicol's Prism. 



[1. On the error in the measurement of a rotation of the plane of polarization 

 caused by the axis, about which the Nicol turns, not being parallel to the 

 incident lii?ht. 2. On a new method of obtaining the zero-reading of a 

 T*Jicol circlG I 



Proc. Phys. Soc. Lond., VII. (1885) pp. 22-39 (7 figs.). 



Nelson, E. M.— Microscopical. \_Supra, p. SGi.'] _.,,„„.. .„„ 



' r L ^^^^^^ ^^^^^^^ ^^^ (1885) p. 523. 



Nicol Prism, repairing. . , , 



[Nicol prisms which have become scratched and dull may be restored by 

 ' cementing a thin cover-glass over the ends with clarified gum-damar. 

 The prisms should first be carefully cleaned with a very soft brush and 

 soap, to which may be added a little precipitated chalk. They should 

 then be rinsed with distilled water and carefully dried, pains being 

 taken to remove every particle of dust and dirt from within the scratches. 

 The cover-glass, which should be thin and perfectly clean, should then 

 be applied in the usual way, exactly as in making a balsam mount. 

 When carefully done, not a vestige of the scratches can afterwards be 



The Microscope, V. (1885) pp. 188-9. 

 "Obd ERIC Vital."— New Optical Glass. . ^ ,x-t 



TFeil's " extra dense flint. No. 1738." Also remarks by A. Caplatzi.J 

 ^ Engl. Meek., XLI. (1885) p. 519 ; XLII. (1885) p. 15. 



Perfect Laboratory Microscope. 



[Four questions for " Professors and others who have had large experience 



in microscopical work " to answer, as to the model of Microscope generally 



preferred by educational institutions.] , . xr ,ioorN o«r 



^ Micr. Bulletin (Queen's), XL (1885) p. 25. 



Queen's (J. W. & Co.) Resistance Coil. 



rDe8i"Tied especially for use with micro-electric lamps.] 

 *■ ° ^ J l/icr. i?«/feto (Queen's), n. (1885) p. 30 (1 fig.). 



"Rector, F.R.A.S."— The Optical Lantern. 



[Queries as to improvements. (Four wick lamps burning best kerosene oil 

 give as much light as can possibly be obtained from that medium.) Also 

 facetious reply by A. Caplatzi, mainly as to the excessive heat of such 



^^'"^^■-' Engl. Mech., XLII. (1885) pp. 62 and 84-5. 



"Rob. Cbus." — The Micro-objective. 



[On mounting the lenses of eye-pieces and objectives.] „„„,,„„ , 



"■ ^ ^ W ifecA., XLL (1885) pp. .563-4 (2 figs.). 



-^ See also p. 526. 



ROCHEB, B. DU.-DelaMegaloscopie. (On Megaloscopy.) [Pavi] 



ComptcH Pewlus, CI. (1885) pp. 329-30. 

 Eoyal Society of South Australia, Postal Microscopical Section of. 



[" A \x,x of microscopical objects has been r(;ceivcd from Victoria and duly 



circulated among the members of this section, and a box of South 



Australian objects has been made up in this colony and forwarded to 



Victoria and New South Wales."] 



Trans, awl I'rcK. awi Rep. R. .Soc. S. Australia, VII. (for 1883-4), 1885, p. 130. 



