528 SUMMABY OP CUERENT BESEAECHES RELATING TO 



Logan, J. H. — Eemarks on a device for enabling two observers to view objects 

 simultaneously. 

 [" Half of the rays from the object proceed directly up the main tube, and 

 the other half are reflected into the other one. The reflected rays, how- 

 ever, do not cross tliose of the main tube, but are reflected outside ; other- 

 wise the arrangement resembles that of the Wenham binocular prism. 

 Either such a modified Wenham prism may be used, or two plain 

 reflectors. The one submitted for examination is an experimental one, 

 and works fairly well. Experiments are still being made, the endeavor 

 being to perfect an apparatus that will utilize the whole aperture of the 

 objective in each tube, instead of half, as in the present arrangement."] 



lUd., pp. 120-1 (1 fig.). 

 Mallakd, E. — Traite de CristallograpMe geometrique et physique. Tome II. 

 CrystallograpMe physique. (Treatise on geometrical and physical Crystal- 

 lography. Vol. II. Physical Crystallography.) 

 [Includes Microscope, apparatus, and methods.] 



184 figs, and 8 pis. (8vo, Paris, 1884). 

 Mabtin, E. W. — Photomicrography— Processes and results. 



[Title of paper only, with discussion by Dr. Julien and the President (Dr. 

 J. S. Newberry). The latter thought' that " the problem of a satisfactory 

 microscopic attachment to the lantern still remained unsolved at 

 present."] 



Joum. N. York Acad, of Sci, III. (1885) pp. 105-6. 



Mabtin, W. J. — ^Astigmatism and the Microscope. ISupra, p. 510.] 



The Microscope, VI. (1886) pp. 79-80. 

 Matthews, Dr. J., Death of. Joum. Quekett Micr. Club, II. (1885) p. 279. 



Ma YEE, A. M. — A simple and inexpensive form of Black-ground Illuminator. 



ISupra, p. 514.] Journ. New York Micr. Soc, II. (1886) pp. 28-30. 



Merceb, F. W. — Small Photo-micrographic Camera. 

 [Described Vol. IV. (1884) p. 625.] 



The Microscope, VI. (1886) pp. 60-2 (2 figs.). 



Michie, W. E. — Microscopical Optics. 



[Queries and answers. (1) The binocular prism fitting does not reduce the 

 aperture of high-power objectives when used monoeularly. (2) 1 in. dia- 

 meter is too small for low-power eye-pieces.] 



Micr. Bulletin, III. (1886) pp. 7-8. 

 Micrometer, Standard, Report of Committee on. 



[" Little progress in the work of obtaining copies of the standard for general 

 use among microscopists." One copy broken. Standards should be 

 made of material less liable to destruction than thin glass. Prof. Rogers 

 has consented to prepare a series of copies on thick plate glass or other 

 suitable material.] 



Proc. Amer. Soc. Micr., 8th Ann. Meeting, 1885, pp. 212-3. 

 Mittenzwey, M. — TTeber die acromatische Wirkung der Okulare von Huyghens 

 und Bamsden. (On the achromatic action of Huyghenian and Eamsden eye- 

 pieces.) Central-Ztg. f. Optik u. Mechanik, VII. (1886) p. 61. 

 MiJLLER, G. — See Klonne, J. 



Nelson, E. M. — Some remarks on the interpretation of Microscopic images with 

 high powers. [Post.'] 



Journ. Quekett Micr. Club, II. (1886) pp. 255-9, 283-4, and 286-7. 



NoE, L. H. — Magnification. 



[Reply to Mr. Bulloch's queries, ante, p. 149.] 



Amer. Mon. Micr. Journ., VII. (1886) pp. 58-9. 

 Obersteineb, H. — Ein Schnittsucher. (A section-searcher.) \_Post.'] 



Zeitschr. f. Wiss. Mikr., III. (1886) pp. 55-7 (1 fig.), 

 Objectives, the new Abbe. Amer. Mon. Micr. Journ., VII. (1886) pp. 76-7, 88-92 : 



The Microscope, VI. (1886) pp. 87-8, 111-9: 



Science, VIL (1886) pp. 247, 413-4 



Nature, XXXIV. (1886) pp. 57-8, 



