210 



MICRO-ORGANISMS AND FERMENTATION. 



same principle as the ordinary two-necked flask. It is fitted 

 with a doubly-bent tube (c, d), which dips into a vessel con- 

 taining water, a vertical glass tube (/, -,/) for measuring the 

 height of the liquid in the cylinder, an appliance (6, 6) for 



FIG. 55. 



Yeast-propagating apparatus devised by Hansen and Kuhle : A, air-pump ; 

 B, air-vessel ; O, ferment ing -cylinder ; a, window ; b b b, stirrer ; o c, 

 doubly-bent tube ; d, vessel containing water ; I, cock for drawing off 

 the beer and yeast ; / /, glass tube connected at e and h with the 

 cylinder, and graduated for the measurement of fixed quantities of 

 liquid ; g, filter ; i, india-rubber tube placed at the middle of the glass 

 tube ; j, tube with rubber connection for introducing the pure culture ; 

 k k, connection with the wort- cylinder D ; in, filter ; n n, doubly-bent 

 tube ; o, vessel containing water ; p p, cold water tube ; u, tube with 

 cock () for introducing wort ; t, outlet-tube for the water used in 

 cooling ; q, cock (the wort is allowed to rise to this height) ; r, cock 

 for drawing off wort. 



