(550 SUMMARY OF CUBRENT RESEARCHES RELATING TO 



Iii tlie jtresciKv of an alkali these movements are twice as slow, and in 

 the presence of acid are nine times feebler than in distilled water. 



Felgentkager, W. — Eine einfaches Methode zur Bestimmung der periodischen 

 Fehler von Mikrometerschrauten. 



Vcrhcindl. d. Deutsch. Physik. Gescll., ix. (1907) p. 251. 



Hager, H. — Das Mikroskop und seine Anwendung. (Zehnte, stark vermehrte 

 Aufl. 463 figs.) Berlin : Jul. Springer (1908) 444 pp. 



Jagie, N. t. — Atlas und Grundriss der Klinischen Mikroskopie mit Beriicksichti- 

 gung der Technik. Wien : M. Perles, 1908. 



KJaiser, W. —Die Technik des modernen Mikroskopes. (Zweite, ganzlich 

 umgearb. Aufl., mit vielen Abbild.) Wien: M. Perles, 1908. 



Kitt, Th. — BakterieDkunde und pathologische Mikroskopie fur Tierarzte und 

 Studierende der Tiermedizin. (Fiinfte, wiederholt verbess. u. umgearb. Aufl.) 



Wien : M. Perles, 1908. 



B. Technique.* 

 (1) Collecting' Objects, including' Culture Processes. 



Colour Reaction for the Recognition of Bacillus typhosus.! — 

 E. A. Kindborg employs the following medium : neutral fleischwasser- 

 agar 3 p.c. and lactose 5 p.c, heated in a w T ater bath till completely 

 dissolved ; then add fuchsiu, 5 c.cm. to 100 c.cm. of agar, and mala- 

 chite-green, 4 c.cm. of a normal solution of 1 : 120, and plate out ; the 

 medium solidifies after 24 hours. A suspension of faecal matter in salt 

 solution or in broth is spread over the medium by means of a stout 

 platinum loop. After 12-24 hours incubation the colonies begin to 

 appear, and after 48 hours the decolorising reaction is well marked. 

 The suspicious colonies are then submitted to further diagnostic tests. 



Cultivating Bacillus typhosus and Bacillus coli.} — H. Dunsch- 

 rnann has compared B. coli and B. typhosus with regard to the nutri- 

 tive value of taurocholate and glycocholate of soda in combination with 

 nutrose and malachite-green. The author finds that glycocholate does 

 not increase the amount of growth of B. typhosus, but that taurocholate 

 increases it considerably ; on B. coli the influence of these two salts is 

 intermediate to that on B. typhosus. Nutrose is a favourable nutriment 

 for B. typhosus, but not for B. coli. Malachite-green exerts an anti- 

 septic action on these two organisms. 



Detection of Bacillus coli in Drinking-water.§ — G. E. Gage, from 

 a comparative study of media for detecting B. coli, draws the following 

 conclusions. 1. Lactose neutral-red broth offers a good means of making 



* This subdivision contains (1) Collecting Objects, including Culture Pro- 

 cesses ; (2) Preparing Objects ; (3) Cutting, including Imbedding and Microtomes ; 

 (4) Staining and Injecting ; (5) Mounting, including slides, preservative fluids, etc. ; 

 (6) Miscellaneous. 



t Centralbl. Bakt., lte Abt. Orig., xlvi. (1908) p. 554. 



X Comptes Rendus, cxlvi. (1908) p. 1175. 



& Centralbl. Bakt., lte Abt. Orig., xlvii. (1908) pp. 280-7. 



