Microscope as Brewer’s Life Blood, 1924

1899 illustration of brewing yeast.

“As far as the practical brewer is concerned, complete knowledge of the correct use of the microscope is as necessary as his life blood, for it will save him a host of troubles. Indeed, it passes my comprehension how some prefer to take their chance when you hear them say: ‘I never look at my yeast under the microscope. If it is of a certain solidity and smells all right, and is of a good colour, I never worry further about it!’ This kind of thing may not have led to disaster in former days, when the alcoholic content of beers was such that it was an efficient protection, but to trust to such rough and ready methods in these days must surely court disaster.”

‘The Training of an Operative Brewer’, B.G.C. Wetherall, Journal of the Operative Brewers’ Guild, October 1924