108 SUMMARY OF CURRENT RESEARCHES RELATING TO 



Add 0"04 grm. heavy magnesia and 2 ccm. of solution of ammonia. 

 Heat to dryness. Add 4 ccm. distilled water to re-dissolve carmin^ 

 0*05 grm. magnesia and 4 ccm. ammonia. Mix and add 0*5 grm. 

 picric acid. Heat almost to dryness. Add 15 ccm. of distilled water 

 and warm until boiling begins. Add 95 ccm. of distilled water, warm 

 the mixture, then cool and filter. Add one crystal of thymol. 



(5) Mounting-, including" Slides, Preservative Pluids, etc. 



Mounting Celloidin Sections.* — A. Weber recommends the foK 

 lowing method. Slides are coated with albumin-glycerin. Sections 

 cut with a razor, moistened with 50 p.c alcohol, are laid out flat on a 

 spatula and placed on slides, A few drops of 50 p.c. alcohol are added. 

 Berzelius paper is then applied to the slides in order to soak up the 

 excessive alcohol. A single fine layer of collodion is applied to the 

 slide, which is then plunged, without waiting for the collodion to dry, 

 into 50 p.c alcohol and from this transferred to a bath containing 

 equal parts of alcohol and chloroform. After a sojourn in this fluid of 

 length depending upon the nature of the tissue, the slide is transferred 

 to carbol-xylol, and the preparation is finally mounted in Canada balsam. 



Metallography, etc. 



Recent Micrographical Investigations of Copper.-f — H. Baucke 

 has measured the length and the breadth of the grains in specimens of 

 copper, including trolly wu'e annealed at different temperatures, and 

 gives the values obtained. Heating cast copper containing copper- 

 cuprous oxide eutectic has no effect on the distribution of the oxide if 

 the temperature does not exceed 700° C. Long heating at 800° C, or 

 shorter heating at higher temperatures, causes a coalescence of the par- 

 ticles of oxide into larger globules. 



Control of Work put on Copper and Brass. f — C. Grard shows 

 that in copper, 90/10 brass and 67/33 brass, the microscopic structure 

 is very definitely related to the amount of cold work and subsequent 

 annealing undergone by the specimen, and that accordingly each kind 

 of structure is associated with definite mechanical properties. The 

 methods by which microscopical examination may be used to control 

 manufacturing operations are indicated. 



Nickel-cobalt System. §— 11. Euer and K. Kaneko have studied this 

 system by thermal and magnetic methods, and describe the structure of 

 the alloys examined. The sections were etched with a mixture of 1 part 

 of a 10 p.c ferric chloride solution with 2 parts of alcohol. Each 



* Zeitschr. wiss. Mikrosk., xxix. (1912) pp. 186-7. 



t Proc. Int. Assoc. Testing Materials, ii. (1912) No. 11, 14 pp. (10 figs.). 

 X Proc. Int. Assoc. Testing Materials, ii. (1912) No. 11, 13 pp. (79 figs.). 

 § Metallurgie, ix. (1912) pp. 419-22 (14 figs.). 



