Yesterday, one of our ever-curious Meebo patrons asked us to find out how much grain was used in the Middle Ages to make a cask of ale or beer. Well, dearest user, I may not have found the answer you seek per se, but I sure did learn a lot about beer.
This site provides some interesting medieval ale recipes as well as some historical facts and figures on ingredients. The author, using some intricate math, has figured that about 6.4 pounds of grain would be used for a gallon of ale.
This particular site has some good information on the history of beer and ale in general. Lastly, I thought that this site was a lot of fun. It provides information on brewing Medieval and Elizabethan ales and meads.
I hope this information helps you out, Meebo patron. And remember, if you brew some beer, you should always share with your local librarian!