122 PASTEUR 



Having constructed a hot-house on a small 

 property that he owned near Arbois, Pasteur 

 succeeded in demonstrating that the fermenta- 

 tion was due exclusively to germs which made 

 their appearance on the surface of the grapes 

 and on the bark of the vines at the moment of 

 maturity, and that neither verjuice nor the 

 must of the grape isolated from the skins and 

 stems can undergo fermentation. 



But, although he was still disputed, he had 

 the keen pleasure of seeing certain of his 

 methods eagerly adopted by the big industries. 

 During a visit to a vast Italian silk-worm es- 

 tablishment, on the occasion of a congress of 

 silk producers held at Milan, he beheld his own 

 name inscribed across the pediment of the 

 building, in conspicuous homage to the services 

 he had rendered to that industry. On this same 

 occasion they showed him the marvellous re- 

 sults obtained by his process of cellular culture, 

 practically carried out by young girls who had 

 acquired great expertness in the use of the mi- 

 croscope for detecting corpusculous moths. 



