That explains why I like Pumpernickel bread! lol
Enjoyable to read this history for an everyday item like bread. Good idea for an article.
yeast, as an isolated item was only available from the 19th century on. The french professor Pasteur did a lot of research on the subject and identified the living organism, that yeast is. Pasteur lived from 1822 - 1895.
But no worries. Yeast is abundant and every where. Yeast is a living organism. It floats in the air. Different families of yeast float in different areas of the world, and multiple families float in the same environment. The early bakers and the early brewers (actually the same profession in the early days) used these wild yeasts, without understanding what it was. They just knew the results. By the way: beer is liquid bread, same ingredients just more water.
You can do the same test as they did. They exposed to the open air for about one day a sweet liquid. Wild yeast, feeding on sugars jump into the liquid and ferment the liquid: fermentation is converting sugars into alcohol and CO2, while the yeast multiplies itself fast in an exponential way. By the way, it is known that prisoners hide a cup of smashed fruit, drenched in some water, under their bed for 6 days with the intend to create an alcoholic beverage. It works!
You are right about the early technique of transfering yeast from one batch to the next one, be it bread (sour-dough) or beer. This technique is the domestication of wild yeast. Any time however, the brewer/baker could harvest again, start over again with the wild yeasts.
Only in the second half of the 19th century was yeast commercially available to be added to grape-juice (wine), apple-juice (cider), or wort (beer). Wort is what you get by mixing milled malted grain and water, and heating it up for an hour or more, without boiling. The starches of the grain become sugars. Thus wort is a sugar rich liquid made from grain. Malt is grain that has been put in a warm-moist environment to make it germinate. Once the germination is started it is immediately stopped. Germination breaks the 'long' starches in the grain-kernel into multiple 'short' starches. These are better for brewing.
I love sourdough bread it's my favorite. I would love to make some homemade bread but the idea of using yeast gives me a bit of a scare. Nice article.

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I wonder when you talk about 'brown bread' do you mean wholemeal?