Beer-makers do this; if you are thinking of trying it Palmer goes into
it under the 'yeast' chapter. He describes several ways to propagate
yeast. You may be able to find it online because the book exists
online at howtobrew.com.

They recommend this book highly at rec.crafts.brewing so I picked it
up; it's worth every penny I paid. It's the best book I have on
brewing. I got the most recent edition at one of our local homebrew
shops. They are going to sell me more stuff because of him...



Joe