ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
539 
bluish colour ; it is then immersed in the decolorizer (distilled water 
200, oxalic acid 1, hyposulphite of potash 1), until all traces of yellow- 
ness have departed from the section. 
The redwood solution is made as follows: — 1 gram of the pure 
extract of Japan redwood is dissolved in 10 grams of absolute alcohol, 
and then diluted with 900 grams of distilled water. To this are added 
5 grams of a saturated solution of Glauber’s salt and a similar quantity 
of a saturated solution of tartaric acid. 
If this redwood method be combined with Golgi’s sublimate staining, 
the sections, having been stained as above, are placed in a mixture of 
20 ccm. absolute alcohol and 5 drops of 1 per cent, solution of chloride 
of gold and potash, until the sublimate precipitate have become quite 
black, and the red nerve-fibres have assumed a bluish tone. They are 
then washed in 10 grams of distilled water, to which 1 drop of a 5 per 
cent, solution of cyanide of potash has been added, then dehydrated in 
absolute alcohol, cleared up in oil of lavender, and mounted in balsam. 
Burchardt, E. — Eine neue Amylo'idfarbung. (A new amyloid stain.) 
Virchow’s Arch., CXVII. (1889). 
Cf. Fortschr. d. Med., VII. (1889) No. 23, p. 901 ; 
Centralbl. f. Klin. Med., XI. (1890) No. 4, p. 74. 
Dekhuyzen, M. C. — TJeber das Impragniren lebender Gewebe mit Silbernitrat. 
(On the impregnation of living tissues with silver nitrate.) 
Anat. Am.,. IV. (1889) No. 25, p. 789. 
Nickel, E. — Die Farbenreactionen der Kohlenstoffverbindungen. Fur chemische, 
physiologische, mikrochemische, botanische, medicinische und pharmakologische 
Untersuchungen. (The colour-reactions of carbon-compounds. For chemical, 
physiological, micro-chemical, botanical, medical, and pharmacological investiga- 
tions.) 2nd ed., Berlin (Peters), 1890, 8vo, 134 pp. 
(5) Mounting-, including Slides, Preservative Fluids, &c. 
Finishing Balsam Mounts.* — Mr. F. N. Pease finishes balsam 
mounts as follows : — The object is mounted on the slide, applying the 
cover-glass in the ordinary manner, using either balsam, hardened 
balsam, balsam and benzol, storax or dammar. The slide is then 
heated to drive off the solvent or more volatile constituents, either gently 
in a water-bath or at a higher heat, even boiling carefully over a spirit- 
lamp when the nature of the object will permit. When cold, the 
superfluous mounting medium is carefully removed, then a narrow ring 
of paraffin-wax is heated in a capsule until it is melted and quite limpid. 
With the aid of a very small camel’s hair pencil, the melted paraffin is 
applied at the edge of the cover-glass, covering the exposed medium 
and instantly solidifying. It is now necessary to apply a finishing 
cement. For this purpose Bell’s cement has been found excellent. If 
this cement does not work satisfactorily the admixture of some chloro- 
form makes it work smoothly. This cement ring is finished at one 
application, and in a few hours the slide is ready for the cabinet. 
This method is intended to protect the mounting medium from 
becoming discoloured owing to atmospheric influences. 
A new Diatom Mounting Medium.f — Mr. F. W. Weir writes, 
“ C 10 H 7 Br -f Resin of Tolu. — Dissolve 3 oz. of commercial balsam tola 
* Amer. Mon. Micr. Journ., xi. (1890) pp. 66-7. 
f Micr. Bull, and Sci. News, vii. (1890) pp. 23-4 
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