Wood, bones, and various fermentable liquids are other sources of organic compounds.
"An Introduction to Chemical Science"
R.P. Williams
It is all as if into some fermentable medium or solution a little yeast were dropped that changed the quiet calm of its surface into a bubbling, effervescing revolution.
"The Glands Regulating Personality"
Louis Berman, M.D.
It has been found in the case of the beers that this factor averages 2.14, while in the case of the ales it averages 2.12, making an average for all of the products of 2.13. This clearly shows that in the yield of alcohol for a given amount of fermentable solids there is no appreciable difference between top fermentation products, such as ales, and bottom fermentation products, such as beers.
"A Study Of American Beers and Ales"
L.M. Tolman J. Garfield Riley