ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 701 



Stroebelt, O. — Eino vcrbesserte Vorrichtung mikroskopische Beobachtungen 



unter dem Einfluss elektrischer Schliige anzustellen. (An improved arrangement 



fur microscopical observations under the influence of el ctrieal shocks.) [Post.'] 



Zeitsch.f. fnstrumentenk., II. (1882) pp. 274-5 (1 fig.). 



Treskow, H. — Fobrnng am Objeetivtische des Mikroskops nebst Compres- 



sorium. (Carrier to tlie Stage of the Microscope with Compressoriuni.) 



German Patent, No. 13,399, 9th September, 1880, 2 figs. (1 pi.). 

 Yorce, C. M. — [Note as to easy and quick resolution of Amphipleura pellucida 

 in balsam by Bau.-ch and Lomb ^-inch and i-inch objectives, with mirror 

 central, sunlight, and no condenser.] 



Amer. Mon. Mia: Jvuni., III. (1SS2) p. 137. 



Ward, B. H. — The August Meetings. 



[Elmira Meeting of the American Society of Microscopists, and Montreal 

 Meeting of the Amer. Assoc. Adv. Sci. — at the latter the new section 

 of histology and microscopy will meet for the first time] 



Amer. Natural., XVI. (1882) p. G91. 



„ „ Eye Protectors. 



[Description and figure of Pennock's, I. (18S1) p. 518, and description of 

 Hall's, supra, p. 67S.] 



Amer. Natural, XVI. (1882) pp. 691-2 (1 fig.). 

 Wright, L. — Light, a course of experimental Optics chiefly with the 

 Lantern. 



[Contains an Appendix to Chap. IX. on "Diffraction in the Microscope," 

 pp. 200-7, 17 figs.] 



8vo, London, 1882, xxiv. and 367 pp. (190 figs, and 8 pis.). 



£. Collecting, Mounting and Examining Objects, &c. 



Preservative Fluids for Animal and Vegetable Tissues, and 

 Methods of Preservation* — Many years ago, Professor F. Pacini 

 commenced to make microscopical preparations with a view of pre- 

 serving types of different elements of tissues, both normal and patho- 

 logical, and experimented largely with aqueous solutions of different 

 substances in variable proportions ; then, having put up a large 

 number of preparations in these solutions, he allowed some years to 

 elapse in order to see which had best resisted the effects of time. 

 Many, of course, perished; but those which are preserved serve to 

 indicate the best methods to employ. 



Professor Pacini does not deal with tbe well-known methods of 

 preserving, by means of Canada balsam or glycerine, microscopical 

 preparations of hard, dry, or indurated parts, merely observing that 

 tissues, when they have been dried or indurated to obtain sections, 

 have lost their water of organisation, and are not suited to give an exact 

 idea of their minute structure ; it is necessary that they should be pre- 

 served in an aqueous medium of low density, in order that they may 

 present as natural an aspect as possible. Very thin sections of tissues, 

 when preserved in so dense a medium as Canada balsam or glycerine, 

 become transparent ; it is then necessary to stain them in order to 

 render them visible, and whilst they are then certainly more pretty to 

 look at, they are not natural. 



* Joum. de Microgr., iv. (1880) pp. 136, 191, and 235. 

 Ser. 2.— Vol. II. 3 B 



