702 SUMMAKY OF CURRENT RESEARCHES RELATING TO 



Nelson, E. M. — On tlie Formation of Diatom Structure. II. 



Jov.rn. Quel. Micr. Gluh, III. (1889) pp. 308-9 (1 pL), 

 „ „ An instrument for exhibiting tlie 1/2500 in. without a lens. 



Journ. Qnek. Micr. Cluh, IV. (1889) pp. 20-1, 46-7. 

 Neudorf, F., Jr. — Charles Fasoldt Sr.'s Eulings. 



[Claim to have resolved 220,000 lines to the inch.] 



The Microscope, IX. (1889) pp. 157-9. 

 Editorial Note, pp. 148-9. 

 See also St. Louis Med. and Surg. Journ., LYI. (1889) pp. 289-90. 

 P E T T I G BE w, J. B. — On the use of the Camera Lucida. 



Trans. Manchester Micr. Sac, 1888, pp. 80-3. 

 EoYSTON-PiGOTT, 6. W. — Microscopioal Advances. XL VII. 

 [Apochromatic Eidolic dots and Chromatic Beads.] 



Engl. Mech., XLIX. (1889) p. 315-6 (3 figs.). 

 Smith, T. F. — On the Ahhe Diffraction-plate. 



Journ. Quek. Micr. Club, IV. (1889) pp. 5-8. 

 Thompson, J. C. — President's Address to the Liverpool Microscopical Society. 



[Deals largely with Prof. Abbe's theory of the Microscope, " the distinguishing 

 feature of the microscopical science of the last twenty years."] 



Jouim. Liverpool Micr. Soc, I. (1889) pp. 1-24 (2 figs.). 

 Ward, E. H. — Micrometry by the Camera Lucida. 



Queen's Micr. Bulletin, VI. (1889) p. 24. 

 Wenham, F. H. — Large Apertures in Microscopy. 



[Chaiiicteri Stic letter in reference to the old aperture controversy. "I have 

 long since turned out or destroyed every paper or journal that contained 

 matter relating to the subject."] 



Engl. Mech., XLIX. (1889) pp. 438-9. 



C6} Miscellaneous. 



Celebration of the Third Centenary of the Invention of the 

 Microscope. — The executive committee of the International Exhibi- 

 tion of Geographical, Commercial, and Industrial Botany, which will be 

 held at Antwerp in 1890, have decided to celebrate the third centenary 

 of " one of the most fruitful inventions of which science can boast, that 

 of the Microscope." 



With this object the committee propose to organize (1) a retrospective 

 exhibition of the Microscope ; (2) an exhibition of the instruments of all 

 existing makers, of accessory apparatus, and of photomicrography. 



A series of lectures, illustrated by the photo-electric Microscope will 

 be given during the exhibition. They will include (1) the history of the 

 Microscope ; (2) the use of the Microscope ; (3) the projection Micro- 

 scope and photomicrography ; (4) the microscopic structure of plants ; 

 (5) the microscopic structure of man and animals ; (6) microbes; (7) the 

 adulteration of alimentary substances, &c,, &c. 



It is intended to place the exhibition under the patronage of a 

 " Comite d'honneur," which will be " composed of persons who have 

 rendered the greatest services to microscopical science, and who hold 

 the most honoured rank." 



Cronin Mystery, the Microscope in the. Amer. Mon. Micr. Journ., X. (1889) pp. 187-8. 

 Dallinger, Eev. W. H., an Interview with — Science and Christianity. 



Quiver, 1889, pp. 351-5 (3 figs.). 



Deby, J., Bibliotheca Debyana, being a catalogue of books and abstracts relating 



to Natural Science, with special reference to Microscopy, in the Library of. 



(Vol. I. 1. Serial and Periodical Publications. 2. The Microscope and its 



Tecbnii alilies. 3. The Protozoa.) iv. and 151 pp. 8vo, Loudon, 1889. 



Fasoldt, Charles— Obituary Notices of. The Microscope, IX. (1889) pp. 173-4. 



Qioee7i's Micr. Bulletin, VI. (1889) p. 22. 

 St. Louis Med. and Surg. Journ., 1889, p. 366. 



