294 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Fell, G. E. — Eeport of Committee on Micrometry. 



, Proc. Amer. Soc. Micr., X. (1888) pp. 163-4. 



Gaeiel, C. M. — Etudes d'Optique Geometrique, Dioptres, Systemes Centres, 

 Lentilles, Instruments d'Optique. (Studie? in Geometrical Optics, Dioptrics, 

 Centered Systems, Lenses, Optical Instruments.) 



viii. and 240 pp., 149 figs. 8vo, Paris, 1889. 

 Magnifying Power, The Determination of. A prevalent Error. 



Queen's Micr. Bulletin, V. (1888) p. 17. 

 Meslin, G. — 



[Explanation of the reason why one sees in the bright circle of light of the 

 Microscope his own eyelashes as an inverted or erect image, according to the 

 kind of ocular used. The explanation lies in the fact that the lashes pro- 

 duce in the cone of light which proceeds from the mirror a shadow figure, 

 the projection of which into the retina depends on the focus of the rays 

 issuing from the ocular. If these be little convergent, or the eye be far 

 enough from the ocular, the image would be thrown behind the retina ; 

 accordingly an erect image (perceived inverted) appears. In the reverse 

 condition (strong convergence of the rays issuing fiom the ocular, or a near 

 position of the eye) the image falls in tront of the retina. The shadow 

 figure originates in the prolongation of the rays diverging from the image, 

 which is really inverted but perceived erect.] 



Journ. de Phys., VI. (1887) p. 509. 

 Nelson, E. M. — A Popular Explanation of Interference Phenomena. 



Engl. Mecli., XLVIII. (1889) p. 380 (2 figs.). 

 Po LI, A. — Note di Microscopia. (Notes on Microscopy.) 



Piv. Scient. Industr., 1888, pp. 137-44, 169-75, 190. 

 ,, Le Microscope et sa Theorie. (The Microscope and its theory.) 



Pev. de Bot, VII. (18S8) p. 20. 



[6) Miscellaneous. 



Davis, G. E.— Practical Microscopy. 



New and revised ed., viii. and 436 pp., 310 figs, and 1 pi. 8vo, London, 1889. 

 FoERSTEE. — Vorschlage, betreffend die Begriindung einer dffentlichen tele- 

 skopischen, spectroskopischen und mikroskopischen Schaustatte. (Proposals 

 for the establishment of a public telescopic, spectroscopic, and microscopic 

 observatory.) J'^^akt. Phys., 1888, No. 7. 



Hepworth, T. C. — The Book of the Lantern, being a Practical Guide to the 

 working of the Optical (or Magic) Lantern. With full and precise directions for 

 making and colouring lantern pictures. 



[Chap. XV. The Art of making Photo-micrographs. Chap. XVII. Tlie 

 Lantern Microscope and the Opaque Lantern.] 



2nd ed., x. and 278 pp., 1 pi. and 75 figs. 8vo, London, 1889. 

 James, F. L.— [Value of the Microscope to the Physician.] 



St. Louis Med. and Surg. Journ., LVI. (1889) pp. 27-8. 

 Kellicott, D. S. — Annual Address of the President (of the American Society of 

 Microscopists.) Proc. Amer. Soc. Micr., X. (1888) pp. 5-32. 



L EH MANN, O.— Molekularphysik mit besonderer Beriicksichtigung mikroskopischer 

 IJntersuchungen, und Anleitung zu solchen, sowie einem Anhang iiber mikro- 

 skopisehe Analyse. (Molecular physics, with special reference to microscopical 

 investigations, and a guide thereto, as well as an appendix on microscopical 

 analvsis.) 



[Contains an appendix on microphysical and microchemical methods in chemical 

 analysis of crystals, pp. 533-55, figs.] 



Vol. II., vi. and 697 pp., 250 figs, and 5 pis., 8vo, Leipzig, 1889. 

 Levy, A. M., and A. Laceoix.— Les Mineraux des Roches. (The Minerals of 

 Kocks.) 



[1. Application of mineralogical and chemical methods to microscopical study. 

 By A. M. Le'vy. 2. Physical and optical facts. By A. M. Levy and A. Lacroix. 

 (Microscopes and Comparator, pp. 54-9, 4 figs.).] 



xi. and 334 pp., 218 figs, and 1 pi. 8vo, Paris, 1889. 

 Microscope-makers, A Good Hint to. 



[The Bridge to the Monument, from Lowell's ' Biglow Papers.'] 



Queen's Micr. Bulletin, V. (1888) p. 25. 

 Reck NAG EL, G.— Kompendium der Experimental-Physik. (Compendium of Ex- 

 perimental Phvsics.) 



[Das Mikroskop, §§ 709-13 (4 figs).— The Microscope figured is a French form !] 

 2nd ed., xix. and 1008 pp., 616 figs. 8vo. Kaiserslautern, 1888. 



