562 SUMMARY OF CURRENT RESEARCHES RELATING TO 



by tho small funnel stopper mentioned ante, p. 8G2, The lower end 

 of the tube, bent somcwliat in the sbapc of a letter S lying down — OQ, 

 is attacbed to the flexible tube of tbc aspirator, the upper end being 

 closed by the funnel stopper. This is plugged at its lower end by 

 sterilized glass wool, which is covered by a layer of sterilized salt. 

 After the air has been drawn by the aspirator through this double 

 plug, the salt, with the retained germs, is added to the bouillon used 

 for the culture operations. 



Examining Vegetable Powders.* — In tho niieroscopical investi- 

 gation of a vegetable powder as to its purity and its freedom from 

 adulteration, Dr. A. Meyer recommends tliat it should be examined 

 in water under a power of 50 diameters, and if a foreign element 

 is detected this is magnified 180 diameters, and drawn with 

 a camera lucida. The drawing is then compared with drawings 

 which have been made under a similar magnification of the elements 

 of the suspected adulterating material. Lastly, one compares, under 

 a very high power, tho suspected elements with as freshly-prepared 

 specimens as possible of the adulterating material. 



An account of the anatomical appearances and structure of tho 

 fruits of the buckwheat and maize follows, with a description of tho 

 action upon them of reagents : e. g. potash, Schultze's fluid, &c. 



Sterilization of Fermentable Liquids in the Cold.f — M. A. Gautior 

 describes a process for sterilization in tlie cold by means of a filter 

 made of biscuit porcelain or faience rendered vacuous. Tlio filter is 

 placed in the particular liquid and the receiver connected with it. 

 The liquid passes through the porous walls of the filter and thenco 

 into the receiver, and in this way solutions of albumen, serum, grape- 

 juice, peptones, milk, &c., can be sterilized without tho application 

 of heat. 



A DY, J. E. — The Microscopic Study of Rocks. III., IV. 



[Methods of procuring suitable spccimensof rocks and preparing sections from 

 tliem for microscopical examination, witji a description of hummer, and 

 slitting and grinding machine.] 

 [Petrogra])liist's grinding bench — Mounting rock sections for microscopical 

 examination.] 



III. Sci. Monthly, III. (1885) pp. 99-103 (i figs.), 131-3 (2 figs.). 

 Anderson, J., Jun. — Crystals for the Polariscope. 



[Complaint that such slides are not permanent. Nearly all his slides 

 "show signs of deterioration, and in some the crystals have vanished 

 altogether."] 



Sci.-Gossip, 1885, p. 90. 

 AssMANN, R. — Mikroskopische Beobachtung der Wolken-Elemente. (Micro- 

 scopical Observation of Cloud-Elements.) IPost.'] 



Naturforscher, XVIII. (1885) pp. 120-30, 

 from Meteoroloq . Zeitschr., II. (1885) p. 41. 

 A r BERT, A. B. — The Gum of liquidambar styraciflua or American Storax as 

 a Mounting Medium. [Post.'] 



Amer. Mon. Micr. Journ., VI. (1885) pp. 8G-7. 



• Zeitschr. f. Wiss. Mikr., i. (1884) p. 309. 



t Bull. Soc. Chim., xlii. pp. 140-50. See Journ. Chem. Soc— Abstr., xlviii. 

 (1885) pp. 287-8. 



