Bacteriologie. 293 



Papier und sterilisiert ^ Stunde bei 100°. Vor dem Gebrauch mischt 

 man 4 Teile der alkalischen Peptonlösung mit 6 Teilen neutralem 

 Agar (3 gr. Agar, 1 gr. Pepton, 0,5 gr. Chlornatrium, 100 ccm. 

 Wasser) und giesst in Platten. Ein Sterilisieren der alkalischen 

 Peptonlösung mit dem Agar ist zu vermeiden. G. Bredemann. 



Greig-Smith, R., Contributions to our Knowledge ofSoil- 

 Fertility. Part I. The Action ofWax-solventsandthe 

 PresenceofThermolabile Bacteriotoxins in Soll. (Linn. 

 Soc. N. S. Wales, Abstr. Proc. Nov. 30th, 1910. p. III.) 



Water extracts from soil a substance which is tilterable through 

 porcelain, and which is toxic to bacteria. The toxicity is made evident 

 by the retardation of growth, or by the destruction of bacteria which 

 have been added. The toxin is destroyed by heat, by sunlight, and 

 by storage. It slowly dissappears from air-dried soil, and rapidly 

 decays in aqueous Solution. It is not destroyed by salts such as 

 sodium Chloride or potassium sulphate. Solls vary in the amount 

 of toxin they contain, good soils containing less, poor soils more. 

 The particles of soil are covered or " water proofed" with soil-wax, 

 or "agricere,'' which consists of a mixture of saponifiable and unsa- 

 ponifiable bodies. The waxsolvents (volatile disinfectants) alter the 

 distribution of the agricere bj^ carrying it to the surface of the soil, 

 and causing it to be segregated on the points of the soil-particles. 

 With the removal of the "waterproofing," the soil-nutrients are more 

 easily dissolved by soil-water, and attacked bj^ bacteria. 



Author's notice. 



Greig-Smith, R., The Permanency of the Characters ol 

 the Bacteria of the Bacillus co/z-group. (Linn. Soc. N. S. Wales, 

 Abstr. Proc. Nov. 30th. 1910 p. IL— III.) 



Twelve races of bacteria of this group, upon their isolation 

 from rachitic stools, 5howed diverse cultural characters Thej' were 

 cultivated in the laboratory for seven months, and again examined. 

 The activities towards dextrose and mannit were found to be the 

 most permanent. The permanenc}^ of the other characters was in the 

 following Order: lactose, neutral-red, motihty, milk, growth on gelatin, 

 Saccharose, the power of fermenting which is the most easily acquired 

 and presumably the most easily lost. The twelve races became re- 

 duced to eight. Author's notice. 



Heim, L., Ueber anaerobiotische Technik, einige Anaero- 

 bier und beginnende Eiweissfäulnis. (Centr. Bakt. 1. Abt. LV. 

 p. 337. 1910.) 



Zur Anlegung von anaeroben Platten eignet sich nach Verf. fol- 

 gendes Verfahren gut; Auf einer Glasplatte wird in geeigneter näher 

 beschriebener Weise mittels Plastilin die mit dem Nährboden be- 

 schickte und geimpfte Glasschale aufgekittet, nachdem man vorher 

 auf die Glasplatte ein mit alkalischer PyrogalloUösung getränktes 

 Wattebäuschchen aufgebracht hat. 



Bei Untersuchungen über den Bac putrificus bemerkte Verf. in 

 der Literatur manche Unrichtigkeiten und Lücken, von deren Rich- 

 tigstellung hervorgehoben sei: Die Form der Sporangien ist nicht 

 trommelschlägerförmig, sondern hat Tennisschläger, manchmal 

 Clostridiuni-F orn\\ die Sporen in Leber-Leberbouillon in siedenden 



