700 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Hitchcock, E. — Uniformity in Oculars. 



[" The only way to secure uniformity is to convince purchasers of its 

 importance."] 



Amer. Mon. Micr. Journ., III. (1882) pp. 155-6. 

 ; , „ Table of Numerical Apertures. 



[Brief additional remarks.] 



Amer. Mon. Micr. Journ., III. (1882) p. 156. 

 M., W. H. — Schrauer's Microscope. 



[Travelling instrument with removable base, not requiring a box, but to 

 be " laid between other goods in one trunk."] 



Amer. Mon. Micr. Journ., III. (1882) pp. 158-9. 

 Mackenzie, J. — Two forms of gas lamp specially for use with the Microscope. 

 (Exhibited.) 



[No description.] 



Journ. Quek. Micr. Club, I. (1882) p. 105. 

 Martens, A. — Ueber die hygienische Ausstellung in Berlin. (On the 

 Hygienic Exhibition in Berlin.) 



[Records the fact of the exhibition of various Microscopes, apparatus, and 

 preparations.] 



Central-Ztg. f. Optik u. Mech., III. (1882) pp. 145-6. 

 4 Northern Microscopist ' Verification Department (conid.). 



North. Microscopist, II. (1882) pp. 239-40. 

 Numerical Aperture and Micrometric Tables. 



[From pp. 7 and 8 of the Wrapper of this Journal.] 



Amer. Mon. Micr. Journ., III. (1882) p. 134. 

 Pelletan, J. — Microscope " Continental " (" Continental " Microscope). 



[p. 356 : Announcement that it will be ready for delivery on 1st 

 September. — " It represents a ' Centennial ' of Zentmayer or a 

 ' Congress ' of Bulloch constructed a l'Europeenne." pp. 406-7 : Descrip- 

 tion of the instrument.] 



Journ. de Microgr., VI. (1882) pp. 356, 406-7 (1 phot.). 

 Pinkernelle, W. — Apparat zur Erleichterung der Mikroskopischen Unter- 

 suchung von Flussigkeiten. (Apparatus for facilitating the microscopical 

 observation of fluids.) 



[Abstract of German Patent, No. 18,071, 31st May, 1881. Simply a slide 

 made of two glass plates cemented together with a channel between 

 them. A tube connected with one end dips into an open vessel with 

 the fluid to be examined, and one connected with the other passes 

 through the cork of a closed receiver, which is also pierced by a second 

 tube ending in an indiarubber ball. A stop-cock at each end of the 

 slide regulates the flow. — Also suggestions for simplifying it by substi- 

 tuting a long tube for the receiver so as to act as a siphon.] 



Central-Ztg. f. Optik u. Mech., III. (1882) p. 155 (1 fig.). 

 Pouchet, G. — See Chevalier, A. 

 President's Address [Abstract of, conoid."]. 



Amer. Mon. Micr. Journ., III. (1882) pp. 128-32. 

 " Prismatique." — Object-glass working, I. 

 [Practical directions.] 



Engl. Mech., XXXVI. (1882) p. 54. 

 Royston-Pigott, G. "W. — Microscopes and Microscopy. 



[Lecture to the ' Eastbourne Young Men's Christian Association.'] 



Engl. Mech., XXXV. (1882) pp. 231-2. 

 Standard Gauges for Eye-pieces and Substages. 



[Note on the Committee's report, ante, p. 595—" it is to be hoped that for 

 the future eye-pieces will only be made of the specified sizes; the 

 inconvenience attending the parts of various instruments not being 

 interchangeable is very great, and might in the course of a few years 

 disappear if all new instruments were made to the standard sizes."] 



Journ. of Set, IV. (1882) pp. 502-3. 

 Steinheil's Achromatic Eye-pieces. 



This Journal, II. (1882) p. 551 (2 figs.). 

 Engl. Mech., XXXV. (1882) p. 570 (2 figs.). 



