ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 335 



they owe to the "amateurs," who alone have been the means of 

 bringing the Microscope objective to its present pitch of perfection. 



There is plenty of scope for useful and proper exhortation to 

 microscopists without descending to the caricatures of the writer in 

 question. 



American Society of Microscopists, Constitution and Bye-laws of, and List of 

 Members and Officers. 



Proc. Amer. Soc. Micr., 7tli Ann. Meeting, pp. 283-93 and ii. 

 Anthony, W. A. — See Micrometer. 

 Atwood, H. F. — A new Apparatus for Photo-micrography. [^Supra, p. 330.] 



Proc. Amer. Soc. Micr., 7th Ann. Meeting, 1884, pp. 176-7 (1 fig.). 

 B.Sc. — Microscope. 



[Recommendation to stick to monocular. " The great majority of men who 

 use the Microscope as a tool and not as a plaything look upon the English 

 craze for binoculars and complicated stages and accessories as sheer waste 

 of time."] 



Engl. Mech., XL. (1885) p. 457. 

 „ See Short v. Long Body-tubes. 

 Bausch, E. — The Universal Screw for Microscope-objectives. 



[Complaint of discrepancies in the standard gauges sent out by the Society, 

 and suggestion for " decisive action on the question of a new Universal 

 Screw. . . . We need a screw which is larger than 0"8 in., but still of 

 such a size that it can be universally applied to instruments as now 

 made."] 



Proc. Amer. Soc. Micr., 7th Ann. Meeting, 1884, pp. 153-9. 

 See also Science, V. (1885) p. 179, 

 ,, „ Considerations in testing Objectives. 

 [General remarks, dealing principally with adjustment of mirror, thickness 

 of cover-glass, and variations in length of tube.] 



Tlie Microscope, V. (1885) pp. 1-5. 



Behrens, W. — WiiLkel's Mikrometer-ocular mit vertical beweglichen Mikrometer. 



(Winkel's Micrometer eye-piece, with Micrometer moving vertically.) [Posl] 



Zeitschr. /. Wiss. Mikr., II. (1885) pp. 41-3 (2 figs.). 



BoTTEEiLL, 0. — The Theory and Practice of Microscopical Illumination. 



[Abstract of Presidential Address to the Liverpool Microscopical Society.] 



Sci.-Gossip, 1885, pp. 64-5. 

 Bradbuky, "W. — The Achromatic Object-glass, XLIV. 



Engl. Mech., XL. (1885) pp. 489-90 (5 figs.). 

 Bulloch, W. H. — The magnifying power of Microscope-objectives and Lenses. 

 [1. Magnifying power of objectives measured from the posterior focus for 

 parallel rays. (Results of a series of measurements to fix the position of 

 the posterior focus of different objectives and the magnifying powers at 

 10 in., 12i in., and 15 in. from the ascertained focus, with table.) 

 2. The magnifying power of double convex lenses, post. 

 8. The position of the WoUaston camera in measuring objects. " As 

 there is some disagreement among microscopists as to whether it 

 makes any difference in the measurement of objects by means of the 

 WoUaston camera lucida if the distance is the same between the table 

 and the camera and the camera and the object on the stage, he made 

 some measurements (residts given in a table) to test the matter, and 

 cannot see that it makes any difference whether the distance between 

 table and camera, is changed or with the draw-tube the distance between 

 camera and object."] 



Proc. Amer. Soc. Micr., 7th Ann. Meeting, 1884, pp. 183-5, and table. 

 Carpenter, W. B.— See Nelson, E. M. 

 Cheeseman, E. L. — A Growing Slide. 



[Ordinary slide with cover confined by a light rubber band and immersed 

 in a dish of water.] 



Amer. Mon. Micr. Jown., vi. (1885) p. 53, 



