214 "DISEASES" OF BEER, 



Brewing at Munich, and in the ' Zeitschrift fur das ges. Brau- 

 wesen ' for 1891, Will gives an account of a series of elaborate 

 investigations which he carried out with two new Saccharo- 

 mycetes. The effect of one of these species was to com- 

 municate to low-fermentation beer a characteristic sweetish 

 taste, and a harsh, bitter after-taste, whilst the clarification 

 of the beer during the secondary fermentation took place 

 more slowly than when the cells of this species were not 

 present The effect of the other species was, in the main, the 

 same. Both species are dangerous in the manufacture of low- 

 fermentation beer. 



Krieger has also published accounts from the Brewing 

 Station at New York, in which he mentions wild yeasts which 

 diminish the stability of beer, and at the same time commu- 

 nicate to it a bad flavour. 



In the ' Wochenschrift fur Brauerei ' for 1889, Windisch 

 describes some fermentation experiments with different species 

 of brewery yeasts, and with a species of the group of Sacck. 

 Pastorianus y which is not further defined. These experiments 

 were carried out with flasks charged with sterilised wort. 

 The beer obtained with the wild yeast mentioned did not 

 become bright, and it had a disagreeable bitter taste, which 

 was followed by a harsh after-taste. 



In the same journal for 1891, P. Lindner stated that he 

 had come across a yeast which closely resembled the low- 

 fermentation yeast of a brewery. Judging from the appear- 

 ance of the fermentation, the clarification of the beer, and the 

 character of the sedimentary yeast, the practical brewer would 

 have regarded this as an excellent bottom yeast, but it, never- 

 theless, produced a beer having an abominable bitter and 

 harsh taste. This dangerous yeast had gained access to a 

 brewery in Berlin, and gradually increased to such an extent 

 in the pitching yeast the.t the beer soon began to acquire the 

 offensive flavour mentioned. This is not only a new example 

 of the manifold nature and the danger of the disease yeasts, but 



