ZOOLOGY AND BOTANY, MICKOSCOPY, ETC. 161 



PscHEiDL, W. — Bestimmung der Brennweite einer Concavlinse mittelst des zuzammen- 

 gesetzten Mikroskops. (Determination of the focus of a concave lens by the 

 compound Microscope.) SB. K. Akad. Wiss. Wien, XCIV. (1886) pp. 66-70. 



Quimby's (B. T.) Slide-carrier. 



[Two thin pieces of wood, rather larger than a slide, with a round hole piercing 

 their centre. Narrow strips of sufficient thickness are fastened between the 

 top and bottom pieces, dividing the interspace into three compartments, into 

 the middle of wljich a square of blue glass may be inserted, while the end spaces 

 are for the clips. In the upper surface of the carrier behind is a ridge to prevent 

 the slide from slipping down.] 



The Microscope, VI. (1886) pp. 269-70. 

 KoTSTON-PifiOTT, G. W. — Microscoplcal Advances. XV. 



[On the circular solar spectrum.] Engl. Mech., XLIV. (1886) p. 337 (9 fio-s.). 



Sargent, T. L.- See Wells, S. 



ScHEODEE, H. — Notiz In Bezug auf Korrektion des sekondaren Spektrams. (Note on 

 the correction of the secondary spectrum.) 



[Having examined about fifty varieties of glass used by Boss and Co., from DoUond'a 

 time, and having determined the constants of each for the seven principal lines 

 of the spectrum, he found three varieties which are suited to secure the absolute 

 coincidence of any three lines in the spectrum ; these are dense English flint, a 

 crown glass of high dispersion and relatively low index made exclusively for 

 Koss and Co., and a variety of plate glass containing a high proportion of 

 aluminates which has a mean index as great as that of the crown glass. A good 

 achromatic compound Eoss Microscope being used as eye-piece, it was found 

 that (the objective being small) absolutely no secondary colours were to be 

 observed either at the focus or away from it, although tlie calculations point to 

 the existence of such. By the combination of both sorts of crown with light 

 English flint coincidence of the lines D E G was attained, and a combination of 

 both sorts of crown with dense English flint was made to ensure coincidence of 

 the linea B D G.] 



Centrd-Ztg.f. Opt. u. Mech., VII. (1886) pp. 205-6. 

 Science Directory. Sci.-Gossip, 1886, p. 256. 



Science in 1886. 



[" The new optical glass which has been invented by Abbe, of Jena, is of great 

 interest, especially among microscopists, vastly improving the observing power 

 of the instruments with which they work."] 



Times, 6th January, 1887, p. 8. 



Stein, S. T. — ^Das Licht im Dienste wissenschaftlicher Forsclmng. (Light as an aid 



to scientific research.) V. Die Photogrammetrie, Miiitarphotographie und Optische 



Projektionskunst. (Photogrammetry, military photography, and the art of optical 



projection.) 2nd ed., viii. and 146 pp. and 170 figs., 8vo, Halle, 1887. 



Stenglein's Mikrophotogramme zum Studium der angewandten Naturwissenschaften. 



Lief. I. 16 pp. and 12 photomicrographs, Berlin, 1886. 



Strashurger, E. — Handbook of Practical Botany for the Botanical Laboratory and 



Private Student. Edited from the German by VV. Hillhouse. Revised by the author 



and with many additional notes by author and editor. \_Supra, p. 120.] 



xxiv. and 425 pp., 134 figs., 8vo, London, 1887. 



[Also edition in Ru«sian, xiv. and 304 pp., 114 figs., 8vo, Moscow, 1886.] 



T aschenbeeg, O. — Bibliotheca Zoologica II. Verzeichniss der Schriften iiber Zoologie 



welche in den periodischen Werken euthalten und vom Jahre 1861-1880 selbstandig 



er^chienen sind. (Index to the zoological papers contained in periodicals and which 



have appeared separately from 1861-80.) 



[Continuation of Cams and Engelmann's Bibliotheca Zoologica, 1846-60. Parts 

 1 and 2 contain a bibliography of tlie Microscope and microscopical technique, 

 pp. 279-348, including A. C. Swinburne's 'Under the Microscope' !]. 



8vo, Leipzig, 1886. 

 Tee AT, M.— See Wells, S. 



W.— AussteUung -wissenschaftliclier Instrumente, Apparats und Praparate. (Exhibition 

 of scientific instruments, apparatus, and preparations.) 



[Brief description of the Exhibition at Berlin, which included Microscopes and 

 polarization and photomicrographic apparatus.] 



Zeitschr. f. Instrumentenk., VI. (1886) pp. 348-52, 388-91. 

 Wales, W. — A Cover-carrier for Immersion and Dry Lenses. [^Post.'] 



Journ. N. York. Micr. Soc, II. (1886) pp. 125-6. 

 Wells, S., Tee at, M., and Saegent, T. L. — Through a Microscope: something 

 of the science, together with many curious observations, indoor and out, and direc- 

 tions for a home-made Microscope. iii. and 126 pp., 8vo, Chicago, 1886. 

 1887. M 



