368 



STUDIES ON FRRMENTATION. 



that is to say, when the quantity of oxygen held in solution 

 was as large as the treatment to which it had been subjected 

 allowed of its being. The mode of taking it for examination 

 is as follows : — A burette, H (Fig. 81), is plunged into the 

 fermenting vessel, the temperature of which at the time is 

 ascertained very exactly, the upper part of tlie burette being 

 fitted with an india-rubber tube, a h, longer than itself The 

 liquid is then sucked up the tube, and soon completely fills the 

 apparatus and runs out at h (Fig, 82). B}'- lowering the tube 

 the whole arrangement thus forms a syphon, and enables us to 

 let the wort that we are experimenting on flow for some 

 minutes ; when every trace of air has been thus expelled, the 

 lower tap is closed and the liquid is introduced into Schiitzen- 

 berger's apparatus. 



Fig. 82. 



As for the saturated wort, the value of which in oxj-gen 

 serves to determine one of the elements of the degree of satu- 



