TimT said:
c) it's easy to over-emphasise the importance of laws relating to gruit or hops now - they may just be consequences of historical movements that we're ignorant of, rather than the cause of them.
This is a good point. In many ways, I think maybe it makes sense to treat the laws as a mere codification of the changes that have already happened on the ground.
I remember reading an article a while ago that argued hops only really became more popular (in England, anyway) from the 16th century, as common land and church land was privatised or enclosed, initially for more profitable wool production. Commoners were pushed off the land into urban slums, and no longer had the means to brew or traipse the commons for herbs; they no longer lived close to the land and had to buy things (and consequently get waged jobs) they might previously have made themselves. Brewing went from being something done in the village by small-scale alewives and brewsters, to something done by big urban brewers (i.e. those with the capital to buy up land and invest in the initial production systems necessary for a high yield). Hops became the herb of choice because of their higher yield, and because of their much-longer lasting preservative properties (i'm sceptical that this is necessarily true, at least compared to some herbs), meaning beer could be distributed much further afield and brewers could thus sell to a much greater market.
So: hops became widespread because of changes in social relations - changes in the way people were able to access all the things. The prevalence of hops in brewing is a mere byproduct (though a tasty one) of beer becoming largely a commercial product, a commodity, rather than something done as part of daily living.
On the other hand, I am writing this on a home-brewing forum, so that kinda throws a spanner in the whole argument.
Also the changes in property relationships i'm talking about can't easily be separated from the changes in religious worship you guys were talking about above, i.e. the rise of various branches of Protestantism may have mirrored the rise and fall of different social classes, in various times and places.
Plus I can't remember where I read any of that and may very well be making it up.