Having found that some of the commonest diseases of beer, such as yeast turbidity and the objectionable changes in flavour, were caused not by bacteria but by certain species of yeast, and, further, that different species of good brewery yeast would produce beers of different character, Hansen argued that the pitching yeast should consist only of a single species - namely, that best suited to the brewery in question.
In the United Kingdom the employment of brewery yeasts selected from a single cell has not come into general use; it may probably be accounted for in a great measure by conservatism and the wrong application of Hansen's theories.
By this method several races of Saccharomycetes and brewery yeasts were isolated and described.
A well-known instance of this is the "top" and "bottom" brewery fermentations (see Brewing).
It is divided between some twenty firms. The premises of Bass's brewery extend over Soo acres, while Allsopp's stand next; upwards of 5000 hands are employed in all, and many miles of railways owned by the firms cross the streets in all directions on the level, and connect with the lines of the railway companies.
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