Logic in 1600s:
In 1652, Rev Samuel Stone, my 12th Great Grandfather, Puritan minister, wrote a book justifying Puritanism – “A Congregational Church is a catholike visible church”. Skimming through, I saw an interesting argument about whether the genus (general, abstract, artificial) is as real as the species (specific, particular, natural) – in fact, the whole thing is about that basically but this bit I liked.