ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 497 



Boys, C. V.— On the production, preparation, and properties of the finest Fibres, 

 [Fibres less than the 1/100,000 in. in diameter were obtained from quartz.] 



Nature, XXXV. (1887) p. 575. 

 Fraunhofer, Joseph von, zur Siikularfeier seines Geburtstages. 



[Sketch of his life, with portrait. Bom 6th March, 1787. Died 7th June, 1826. 

 " Achromatic lenses for Microscopes were made in his workshop ; a large Micro- 

 scope completed in 1816 was furnished with a peculiar measuiing apparatus to 

 the screw-micrometer, which allowed the diameter of objects to be determined 

 to the 1/100,000 of an inch."] 



Central-Ztg. f. Optik u. Mech., VUI. (1887) pp. 73-5 (portrait). 

 Cf. Zeitschr.f. Instrumentenk., VII. (1887) pp. 113-28 (portrait). 

 Glass, the New. — Yet other variations of the ludicrous accounts of this glass. 



[" Professors Abner and Schott have invented a new optical glass, which will be of 

 great value in microscopic photograpliy. It is said tliat while the ordinary- 

 lenses do not admit of distinct reflections beyond 1/500,000 of an inch, this 

 new glass will render l/204,700,000th of an inch visible."] 



Family Doctor, 1887, p. ?,Q. 

 [" As an instance of how a grain of truth may sometimes be transformed into a 

 mountain of error, the Secretary read an item which has been going the rounds 

 of the interior press, and which announced the discovery of a new glass in 

 Sweden, composed principally of boron and phosphorus, of such extraordinary 

 refractive power that lenses made of it would reveal the 1/204,700,000 in."] 



Proc. San Francisco Micr. Soc, 13th April, 1887. 

 Journal of the Eoyal Microscopical Society — ^retrospective and prospective. 



[Review of this Journal.] Nature, XXXVI. (1887) pp. 78-9. 



Mayall, J., Jun. — Conferences sur le Microscope. (Lectures on the Microscope.) 

 Contd. 

 [_Transl. of the Cantor Lectures. See Journal, 1886, p. 869.] 



Journ. de Microgr.,Xl. (1887) pp. 113-24 (12 figs.). 

 Pelletan, J. — Nos Maitres. Charles Chevalier. 



[Memoir and portrait.] Journ. de Microjr., XI. (1887) pp. 177-8 (portrait). 



Rogers, W. A,, Hon. F.R.M.S.— [Sketch of Life.] 



The Microscope, VII. (1887) pp. 45-80 (portrait), 

 v., O.— Messrs. Schott & Co.'s new Optical Glass. 



[Remarks on the table of optical data referred to in Journal, 1886, p. 856.] 



Engl. Mech., XLV. (1887) p. 249 (in part). 

 Williams, G. H. — Modern Petrography: — An account of the application of the 

 Microscope to the study of geology. 



[Contains a note upon Petrographical Microscopes.] 



35 pp., 8vo, Boston, Mass., 1886. 

 Williamson, W. 0. — The Microscope and Geology. 

 [Abstj-act of Presidential Address.] 



£ep. and Froc. Manchester Sci. Stud. Assoc, for 1886, p. 32. 



/3. Teclinique.* 

 CD Collectingr Objects, inclTiding- Culture Processes. 



Method for Preservation and further Cultivation of Gelatin Cnltures.f 

 — Dr. H. C. Plaut preserves gelatin and agar cultivations in the following 

 manner. 



If a plate cultivation, the colony is cut out with a fine sterilized 

 knife, and placed on a sterilized slide in a drop of sterilized water to 

 which a trace of glycerin has been added. The slide is then warmed 

 over a spirit-lamp, and a sterilized cover-glass imposed, which is fastened 

 down with some varnish. This procedure will allow the colony to be 

 examined at any time under high powers, and the original condition of the 

 cultivation will be retained for quite a year. If required for cultivation 

 in other media the colony is always available by merely removiug the 



* This subdivision contains (1) Collecting Objects, including Culture Processes; 

 (2) Preparing Objects; (3) Cutting, including Imbedding and Microtomes; (4) Staming 

 and Injecting; (5) Mounting, including slides, preservative fluids, &c, ; (6) Miscella- 

 neous. 



t Fortschr. d. Med , iv. (1886) p. 419. 



