ZOOLOGY AND BOTANY, MICEOSCOPY, ETC. 139 



upper plate, which will take cover-glasses of 18-22 mm. The arms are 

 flattened underneath and well adjusted in one plane. The thin glass 

 is then put exactly in its place, which is indicated by two marks. By 

 the screw the upper plate is lowered until the four drops of paraffin 

 are in contact with the cover-glass and even press a little on it. 

 The four-pronged wire (fig. 26) is then heated slightly and put on the 

 ends of the four arms, which are thus all heated simultaneously ; the 

 paraffin melts, and as soon as the wire is raised the thin glass is found 

 to be firmly attached by its four corners. The oblique position of the 

 arms e enables the strongest objectives to be focused over almost 

 the whole surface of the cover-glass. 



When the observation is completed it is important to keep the 

 cover-glass exactly in the position which it occupied relative to 

 the slide and to free it from the arms e. Owing to its double curve the 

 bent wire enables some warm paraffin to be conveyed along the edges of 

 the cover-glass corresponding with the long sides of the slide, and the 

 cover-glass is thus firmly fixed. To free the points, the four-pronged 

 wire has only to be again heated and applied to them whilst releasing 

 the screw. There is then nothing further to be done, to withdraw the 

 preparation, than to open a. The preparation is still open on two 

 sides, and the necessary reagents can be applied. 



" Akakia." — The Diatomescope. 



[Objects to the non-coincidence of the axes of the two lenses and the want 

 of coning of the settings, and questions the necessity of the diaphragm. 

 And see post] 



Engl. Mech., XL. (1884) pp. 281-2. 

 American Society of Microscopists, photograph of members of, taken at 

 Kochester, N.Y. Amer. Mon. Micr. Journ., V. (1884) p. 219. 



„ „ „ Rochester meeting of. 



[Comments by the ' National Druggist ' on the remarks of the ' Amer. Mon. 

 Micr. Journ.' and ' The Microscope.'] 



Tlie Microscope, IV. (1884) p. 273. 



)) )■> )» 



[Commendation of the " working-session " at the Rochester Meeting.] 



Micr. Bulletin, I. (1884) p. 52. 

 B.Sc. — Microscopic. 



[Recommendation, on the authority of Waldeger and Recklinghausen, to 

 " always stick to the A eye-piece, otherwise you will hurt your sight."] 



Engl. Mech., XL. (1885) p. 414. 

 Beck's and Bulloch's Microscope Lamps. 



[Beck's, cf. Vol. IV. (1884) p. 628 ; Bulloch's, supra, p. 133.] 



Amer. Mon. Micr. Journ., IV. (1884) pp. 203-5 (2 figs.). 

 Blackburn, W. — See Dippel, L. 

 Beadbiikt, W.— The Achromatic Object-glass. XXXVIL-XLIII. 



Engl. Mech., XL. (1884-5) pp. 277-8, 294-5 (3 figs.), 814-5 (13 figs.), 

 334-5, 358-60 (7 figs.), 401-2, 445 (2 figs.). 

 Brunn, a. v. — Der Westien'sche Universalloupenhalter. (The Westien Universal 

 Lens-holder.) IPost.'] 



Arch. f. Mikr. Anat, XXIV. (1884) pp. 470-1 (1 fig.). 

 Bulloch's Microscope Lamp, see Beck's. 



Chester Society of Natural Science. — A Short Handbook of Natural History for 

 use at the Annual Conversaziones and other Meetings of the Society. 

 [Useful for the scientific arrangement of Zoological and Botanical objects 

 at soire'es, &c.] 



28 pp., Svo, Chester, 18S4. 



