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dusts, against the microscopic germs ever ready to interfere 

 with the course of proper fermentation by the introduction of 

 other noxious ferments. It was necessary to prove that beer 

 remains unalterable whenever it does not contain the organisms 

 which cause its diseases. Many technical difficulties were in 

 the way, but the brewers of Chamalieres tried in the most 

 obliging manner to facilitate things for him. 



This exchange of services between science and industry was 

 in accordance with Pasteur's plan ; though he had been 

 prophesying for fourteen years the greafr progress which would 

 result from an alliance between laboratories and factories, the 

 idea was hardly understood at that time. Yet the manufac- 

 turers of Lille and Orleans, the wine merchants and the silk- 

 worm cultivators of the South of France, and of Austria and 

 Italy, might well have been called as enthusiastic witnesses to 

 the advantages of such a collaboration. 



Pasteur, happy to make the fortune of others, intended to 

 organize, against the danger of alterations in beer, some experi- 

 ments which would give to that industry solid notions resting on 

 a scientific basis. " Dear master," wrote he to J. B. Dumas 

 on August 4, 1871, from Clerniont, " I have asked the brewer 

 to send you twelve bottles of my beer. ... I hope you will find 

 it compares favourably even with the excellent beer of Paris 

 cafes." There was a postscript to this letter, proving once 

 more Pasteur's solicitude for his pupils. " A thousand thanks 

 for your kind welcome of Eaulin's work ; Bernard's support has 

 also been promised him. The Academy could not find a better 

 recipient for the prize. It is quite exceptional work." 



Pasteur, ever full of praises for his pupil, also found excuses 

 for him. In spite of M. Duclaux's pressing request, Eaulin 

 had again found reasons to refuse an invitation to come to 

 Auvergne for a few days. " I regret very much that you did 

 not come to see us," wrote Pasteur to Eaulin, "especially on 

 account of the beer. . . . Tell me what you think of doing. 

 When are you coming to Paris for good? I shall want you to 

 help me to arrange my laboratory, where everything, as you 

 know, has still to be done; it must be put into working order 

 as soon as possible." 



Pasteur would have liked Eaulin to come with him to London 

 in September, 1871, before settling down in Paris. 



The Chamalieresi brewery was no longer sufficient for 

 Pasteur ; he wished to see one of those great English breweries 



P 



