272 MICRO-ORGANISMS AND FERMENTATION. 



He summarises the results of his practical experience with 

 beers obtained with the help of pure cultivated top-yeast, as 

 follows : 



" 1. They have the particular flavour which the brewer 



wishes to obtain ; 

 " 2. This taste is uniform and always remains constant; it is 



characterised by great pureness ; 



" 3. The clarification takes place more readily and more 

 quickly ; 



" 4. The beers are more resistant to the action of bacteria 

 and have a greater stability. 



" It follows from the above that if HANSEN'S method has 

 rendered great service in bottom-fermentation, it is now about 

 to do the same also for top-fermentation, and in the latter case 

 it will be of far greater value, for in top-fermentation we have 

 not the advantage of the low temperature which obtains in 

 bottom-fermentation, and which tends to check the action and 

 the development of disease germs." 



W. R WILSON says, in the " Brewers' Journal " (London, 

 1892, p. 527):- 



" Some gyles have been prepared with pure yeast, and have 

 been compared against ale brewed at the same time, but 

 pitched with ordinary yeast. It is admitted on all hands that, 

 so far as can be at present ascertained, the pure-yeast ale is 

 immeasurably superior to the other. HANSEN'S pure yeast 

 system applied to English high fermentations appears to be 

 equally suitable for ales, porters, and stouts" 



Since then the pure yeast system has been completely 

 carried out in Combe & Co.'s brewery, and, according to reports 

 in English professional journals, many English brewers have 

 employed the species selected by WILSON with uniform success. 



Similar opinions on the importance of HANSEN'S work have 

 been expressed by other zymotechnologists such as DELBRUECK 

 (Berlin), FLUEHLER (Lyon), GRIESSMAYER (Munich), LANGER 

 (Modling), PRIOR (Niirnberg), MAERCKER (Halle), MARX 

 (Marseilles), SCHWACKHOEFER (Vienna), THAUSING (Vienna), 

 and others. Several of his former opponents have become his 

 warmest supporters. 



