ZOOLOaY AND BOTANY, MICROSCOPY^ ETC. 



849 



Fig. 157. 



action, the carbon particles do not change the tissues outside the vessels, 

 the material adheres so firmly to the walls of the vessels that it does not 

 flow out on the surface of sections, the preparations may be hardened in 

 alcohol, chromic acid, &c., without losing colour, and they may be 

 examined fresh in glycerin. The sections may be afterwards stained 

 with any colour. 



A medium quality of black ink is chosen, Japanese rather than 

 Chinese ; it is rubbed down in water till the fluid is such that when 

 dropped on thin blotting-paper it coheres, and forms no grey ring 

 round the drops. The mode of using 

 the fluid is in no way peculiar. Until 

 the preparation is hardened there must 

 be no contact of the section with water. 

 Some sections are figured to show the 

 success of this injection. 



Beck's Microsyringe.* — Prof, M. 

 Flesch recommends Dr. G. Beck's 

 apparatus for minute injection. It is a 

 small syringe, the piston-rod of which 

 is worked by a cog-wheel arrange- 

 ment, and can consequently be used for 

 aspiration as well as injection without 

 a change of hands being necessary. It 

 is so made that the cannula needle fits 

 on quite flush, thus preventing the in- 

 closure of air-bubbles. In the original 

 form the cannula screwed on, but this 

 has been found to be quite unnecessary. 

 The graduation, marked on the piston- 

 rod, is accurate enough to allow about 

 10 com. of a fluid to be injected at one 

 time. The piston washer is made of 

 felt and not of leather. As this 

 material does not become hard when heated the syringe can be disin- 

 fected in an oil-bath at 150° C. without damage. 



The syringe itself and the method of working it are shown in the 

 illustration (fig. 157). 



Baeanski, a. — Zur Farbung des Actinomyces. (On staining Actinomyces.) 



Peutsch. Med. Wochenschr., 1887, p. 1065. 

 DuEDUFi, G. N. — Beitrag zur physiologischen MethylentlaTireactioii. (Contri- 

 bution to the phyciiological reaction of methyl-blue.) 



Deutsch. Med. Wochenschr., XXVI. (1888) p. 518. 

 G IE SON, J. VAN. — The Brain-cortex Stained by Golgi's method. 



New York Med. Fee, XXXIIL (1887) p. 283. 

 GuNTHEE. — Die schnellste Methode znr Farbung von Tuberkelbaeillen. (The 

 quickest method for staining tubercle bacilli.) 



Wiener Klin. Wochenschr., 1888, pp. 292-3. 

 Nickel, E. — Die Farbenreactionen der KoUenstoffverbindnngen. 1. Farbenreac- 

 tionen mit aromatischen Cbarakter. (The colour reactions of carbon combina- 

 tions. I. Colour reactions of an aromatic character.) 



luuugural diss., 42 pp. 8vo, Berlin, 1888. 

 NoTT, T. E. — Staining of Tubercle Bacilli. 



Atlanta Med. and Surg. Journ., 1888, pp. 200-2. 



* Zeitschr. f. Wiss. Mikr., v. (1888) pp. 43-5 (1 fig.). 



