MKTHOD OF STRAUSS AND \VURZ 



101 



gelatine (liquefaction). The germs may then be isolated 

 by further transference to culture plates, and submitted to 

 microscopic examination. 



Cla-> tub.- 



1! nbber cork 



Aspirator 



. M: \ i r- i .PI: i. \.\MI 



o Method of Strauss and Wiirz. Air is drawn into a glass 

 vessel full of liquid gelatine by means of a tube affixed to 



Aperture for the admission of uir 



Vend niir.1 with -datiiu 



lateral tubuhnc 



Fiu. 32. AIK-TKSTIXG APPARATUS OF SiRArss AXD Wcnz. 



the side and connected with an aspirator (fig. 32). A large 

 volume of air, 100 to 200 litres, is thus tested, and when 

 the aspiration is concluded the gelatine is poured out on 



