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BACTERIOLOGICAL ANALYSIS 



LESSON 



(3) Allow the gas to pass over one of the strips of cloth 

 for one to two hours. 



Fia. 14. Flask I contains some copper and sulphuric acid, which are heated over 

 the flame to prepare the sulphur dioxide ; II, Wash bottle containing water ; 

 III, Wide glass tube in which the infected strip of cloth is placed ; IV, Spiral 

 glass tube surrounded by a freezing mixture of salt and pounded ice ; V, 

 Small flask, placed in a beaker containing ice and salt. 



(4) Then remove it and drop it into a broth tube, 

 which is to be kept at 38*5 C. for several days. 



Collecting cylinder filled with water. 



Examine the contents of the tube for growth from day 

 to day, both microscopically and by means of plates. 



