ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 703 



Laljoratoires de Micrographie a rExposition universelle de 1889. (Microscopical 

 Laboratories at the Paris Exhibition of 1889.) 



Ann. dc Micro^jrapldc, II. (1889) pp. 426-8, 483-5, 520-3. 

 Martin, N. H. — A Plea for the Microscope, being the Aiiniial Address delivered 

 before the North of England Microscojiical Society by the President. 



16 pp. 8vo, private circulation, 1889. 

 Mascart, M. E. — Traite d'Optique. (Treatise on Optics.) 



[Microscopes, p. 137.] Vol. I., viii. and 638 pp. (199 tigs.). 8vo, Paris, 1889. 

 Pelletan, J. — La Micrographie a I'Exposition universelle de 1889. (Microscopy 

 at the Universal Exhibition of 1889.) 



Joiirn. de Mkrocjrxphie, XIII. (1889) pp. 3G6-9, 403-7, 430-6, 464-7. 

 „ „ [Distinction between " micrographes " and " microscopistes." 



English and American Microscopy compared with French and German.] 



[" For the one the microscopic object is the subject of study, the Microscope is 

 the means. . . . For the otliers the object is only the means, the subject of 

 study is the Microscope itself."] 

 [" In England anil in America the Microscope is not in the same hands as with 

 us. Whilst in France and in Germany the Microscope is only in tiie hands 

 of professional scientists, and amateurs are rare, it is quite the contrary with 

 the English, where the Microscope is much more common. The world of 

 amateurs is there extremely numerous, fervent, and, it must be recognized, 

 generally rich. These devotees of the Microscoiie form many powerful 

 societies and clubs, and support numerous microscopical publications, often 

 luxurious, always prosperous."] 



lUd., pp. 225-9, 321-6. 

 Eoyston-Pigott, the late Dr. — Obituary Notice. 



Journ. of Microscopy, 11. (1889) p. 254. 

 Engl. Meek., L. (1889) pp. 89-90. 

 SoHOTT — TJeber Glasschmelzerei fur optische und andere wissenschaftliche Zwecke. 

 (On glass-melting for optical and other scientific purposes.) 



Centrcd-Ztg.f. Opt. u. Mech., X. (1889) pp. 221-3 (1 fig.), 232-4 (1 fig.). 



Of. also Queejis Micr. Bulletin, VI. (1889) p. 15, 



from ' Science of Photography ' 



. and ' Ber. Vereins Forderung Gewerbfl.,' 1888, p. 162. 



T Ys ON, J. — Ignorance of the Microscope among Physicians. 



St. Louis Med. and Surg. Journ., LVI. (1889) pp. 368-9, 

 from ' Philadelphia Med. News.' 



/3. Teclmique.* 

 (1) Collecting Objects, including- Culture Processes. 



Culture of Infusoria.f — M. E. Manpas recommends as clamp chambers 

 low flat-bottomed dishes with vertical sides, about 20 cm. in diameter. 

 The dish is partly filled with fine well-washed sand, and in this are 

 planted longitudinally two upright strips of glass, of such a height that 

 the superior edge is 4 or 5 mm. below the level of the edge of the dish. 



On these upright pieces as supports are placed three others, the 

 middle one having a width of 4-5 cm., the two others 2 cm. only. It is 

 on these three slips that are placed the slides bearing the infusoria. The 

 whole is covered by a glass plate fitted as hermetically as possible to the 

 edge of the dish. The dish being filled with rain-water up to the hori- 

 zontal strips, the air-space is reduced to a layer of 4 or 5 mm. in thick- 

 ness. This layer of air is always saturated with moisture, and the 

 preparations suffer only an extremely feeble evaporation. 



After each operation with a pipette, it should be washed with care, by 

 forcing fresh water through it several times. Some infusoria have a 

 strong adhesive power, and it often happens that they are left adhering 



* This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes; 

 (4) Staining and Injecting; (5) Mounting, including slides, preservative fluids, &c. ; 

 (6) Miscellaneous. f Arch. Zool. ExiX'r. et Gen., xvi. (1888) p. 179. 



