464 SUMMAKY OF CURRENT RESEARCHES RELATING TO 



Flesch, M. — Welche Aussichten bietet die Einfiihrung des elektrischen Lichtes 

 in die Mikroskopie? (What prospect does the introduction of the electric 

 light afford in Microscopy ?) [Post.^ 



Zeitschr. f. Wiss. Mikr., I. (1884) pp. 175-81. 



Hansen, E. C— Ueber das Zahlen mikroskopischer Gegenstande in der Botanik. 

 (On the counting of microscopic objects in Botany.) [Post.] 



Zeitschr. f. Wiss. Mikr., I. (1884) pp. 191-210 (6 figs.). 



Hazlewood, F. T.— a home-made revolving Table. IPost.'] 



Amer. Mon. Micr. Journ., V. (1884) p. 94. 



Hitchcock, E. — Neglected Opportunities. 



[Exhortation to investigate the microscopic life of the country.] 



Amer. Mon. Micr. Journ., V. (1884) pp. 95-6. 



„ „ A New Microscopical Society. 



[Sarcastic comment on the announcement of the establishment of the Ladies' 

 Microscopical Society at San Francisco having been first sent to England. 

 " Trusting the members will learn that, although they may look to foreign 

 lands for styles and methods of personal adornment, when they come to 

 such a serious subject as microscopy, their wants can be as well met and 

 their fame as well appreciated in their own country."] 



Amer. Mon. Micr. Journ., V. (1884) p. 97. 



Jadanza, N. — Sui sistemi diottrici composite (On compound dioptric systems.) 

 Atti R. Accad. Sci. Torino, XIX. (1883) pp. 99-117. 



Jung, H. — Ueber ein neues Oompressorium. (On a new Compressor.) [Post.'] 

 Zeitschr. f. Wiss. Mikr., I. (1884) pp. 248-50 (2 figs.). 



Lancaster, W. J. — Lantern Microscope. 



[Directions for making. " You may make a lantern Microscope in half a 

 dozen different ways, and the method to work upon will depend entirely 

 upon the illumination you have. You state in query that you have the 

 lime-light ; you could not have anything better. Fit up your Microscope 

 in any form you like, and for object-lenses get three sets of lenses, A, two 

 IJ in. focus, both piano, one 1/2 in., the other 3/4 in. diameter ; B, two 

 lenses both 1 in. focus, one 3/8 in. diameter, the other 5/8 in. diameter ; 



C, two lenses 3/4 in. focus, one 1/4 in., the other 1/2 in. diameter ; and 



D, two lenses 1/2 in. focus, one 3/16 in., the other 3/8 in. diameter. 

 Mount them in separate tubes in each case, both convex surfaces together, 

 at the following distances apart : — A 1 in., B 2/3 in., 1/2 in., D 5/16 in. ; 

 then a stop must be placed in front of each of the smallest lenses, the 

 larger lens going towards object. The sizes of stops and their distances 

 from small lenses are as follows : — A, 1/8 in. diameter, 1/2 in. in front ; 

 B, 3/32 in., 5/16 in.; 0., 1/12 in., 3/16 in. ; D, 1/16 in., 1/8 in."] 



Engl. Mech., XXXIX. (1884) p. 152. 



LoMMEL, E. — Spectroskop mit phosphorescirendem Ocular. (Spectroscope with 

 phosphorescent eye-piece.) [Post.'] 



SB. K. Akad. Wiss. Munchen, 1883, p. 408. 



Magnifying Powers, Table of, with Note. Micr. Bulletin, I. (1884) p. 23. 



McCalla, a. — The " Congress " Nose-piece. 



[Reply to Mr. Bulloch, ante, p. 300, with woodcuts of his original design.] 

 Amer. Mon. Micr. Journ., V. (1884) pp. 64-5 (3 figs.), 78-9. 

 The Microscope, IV. (1884) pp. 101-2. 



Merceb, F. W. — A New Photomicrographic Camera. [Post.] 



Photography (Chicago), I. (1884) pp. 9-10 (1 fig.). 



Mitchell, G. O. — A Focusing Glass for Photo-micrography. [Post.] 



Amer. Mon. Micr. Journ., V. (1884) p. 80 (1 fig.). 



Nelson, E. M. — On the selection and use of Microscopical Apparatus. 



[Ante, p. 302, repeated here to give the following note :— (1) The Boss is 

 decidedly to be preferred to the Jackson form, mainly on the ground of 



