THE SPIRIT OF PATRIOTISM 109 



resolved to place brewing on a firm basis, es- 

 tablished through experiments, to the end that 

 it should yield nothing but perfect products. 



Since beer was spoiled by the introduction of 

 harmful germs, and its quality corresponded to 

 the quality of the yeast which caused the fer- 

 mentation, it was necessary, on the one hand, 

 to eliminate germs, and, on the other, to obtain 

 a thoroughly lively and perfectly pure yeast. 

 These were the problems to which Pasteur ap- 

 plied himself, and during his sojourn at Cler- 

 mont he manufactured beer according to his 

 own rules, and was able to send a dozen bottles 

 of it to Dumas ! 



But the brewery at Chamelieres was too re- 

 stricted a field. In September, 1871, he set out 

 for England, and he reduced the great London 

 brewers to a point of stupefaction by pro- 

 nouncing upon the quality of their different 

 beers, those that were good and those that were 

 bad, simply by examining them under a micro- 

 scope. With their practical temperament the 

 English grasped the great benefit which their 



