A Fourteenth-Century Plague Treatise, Part 2

As we saw in the first chapter of this medieval plague treatise, some historical commentators believed the plague was spread via poisonous air. At first blush this seems a precursor to modern germ theory. But keep in mind that classical and medieval authors were ignorant of bacteria and viruses (though they sometimes spoke of airborne “seeds” or semina that spread disease).

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HERBALISMCurtis Jirsa
Plant Patents and Seed Catalogs

It’s seed-buying season, so I wanted to share some information about plant patents and protection certificates that you might find in your catalogs. If you’re not already familiar with PVP certificates and utility patents, you’ll soon encounter them in many of the major catalogs out there, including organic suppliers like Johnny’s Seeds and High Mowing.

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