850 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Tanzek, p. — Ueber die Unna'sche Farbungsmethode der elastischen Fasern der 

 Haut. (On Unna's staiuing method for the elastic fibres of the skin.) 



Monatsschr. f. J'raL Dermatol., VI. (1887) No. 9. 

 Ungar. — ITeber Farbung von Spennatozoen. (On stiiininp^ .spermatozoa.) 



Vcrh. jSaturhid. }'irans. /Vc-m.m. Rhclnlandc, XLIII. (1887) SB. p. 303. 



Upson, H. S. — Die Carminfarbung fiir Nervengewebe. (Curnune staining for 



nerve-tissue.) Neurol. Centralbl., VIII. (1888) pp. 819 and 320. 



(5) HoTintingr, including- Slides, Preservative Fluids, &c. 



Continuous Centering of a Cover -glass.* — The Ecv. J. L. 

 Zabriskie finds that a very satisfactory method for the continuous 

 centering of a cover-glass, for subsequent operations with the self- 

 centering turntable, with either a glycerin or a balsam mount, when no 

 cell is employed, is to run a very delicate ring of india-iuk with a fine 

 pen upon the upper, or clean side of the glass slip, while the slip is 

 revolving upon the turntable, and 1/32 in. larger than the cover about 

 to be used, as the first step in the operation of mounting. 



He has heard of such rings being employed on the under side of tho 

 slip. But very few of the latter are such accurate jiarallolograms that 

 a ring on the under side will be central for the upper side, because, when 

 the slip is turned over, it is liable to bo held on the turntable by the 

 pair of diagonal corners, which were not employed in the first instance. 

 And moreover, when the ring is run on the under side the thickness of 

 even a thin slip renders difficult the subsequent centering of a cover 

 by sight. 



If the ring of ink is run on the clean side of the slip it is accurately 

 centered for each subsequent operation ; the cover can be centered 

 witliin it accurately without returning to the turntable, and if the 

 application of a spring-clip causes the cover to slide, the latter can still 

 be immediately readjusted by sight. 



The india-ink dries at once, and does not, as might be supposed, 

 cause any practical difficulty by running in under the cover-glass. In 

 case of a glycerin mount, if there is excess of glycerin around the cover, 

 a small stream of cold water, used to wash away the excess glycerin, 

 also instantly carries away the ring of ink. If there is no excess of 

 glycerin the ring of ink may be left, and it will be entirely hidden by 

 the sealing of the mount, if any dark-coloured cement is used. In case 

 of a balsam mount the ring of ink will be scraped away when cleaning 

 the slide, or if there is no excess of balsam, it may be quickly removed, 

 when the mount has hardened, by the moisture of the breath and gentle 

 rubbing with a haudkerchief. 



Steinach's Filter-capsule.f — Dr. E. Steinach has devised an 

 apparatus for aiding certain manipulations in microscopical technique. 

 It is a glass filter-capsule, and consists of a small round pan 4 cm. high 

 and 6 cm. in diam. (figs. 158 and 159). Its floor is about 2 to 3 mm. 

 thick, is slightly deepened towards the centre, and perforated by numerous 

 funnel-shaped holes, the small ends of which are uppermost. The holes 

 in the bottom of the sieve may vary in size as required, but as usually 

 made are just capable of allowing a fine needle to pass through (about 

 1/2 to 1 mm.). The sieves are of two kinds, according as they arc 

 supported on feet or not. The sieve or filter-capsule is placed within 



' Journ. New York Micr. Soc, iv. (18SS) pp. 159- CO. 

 t Zeitschr. f. Wiss. Mikr., iv. (1887) pp. 433 -8 (2 fig.s.). 



