1866: UK - Gregor Mendel, in Versuche über Pflantenhybriden, interpreted heredity in terms of a pairing of dominant and/or recessive unit characters; that is, ones that could in practice be treated as indivisible and independent particles
1869: UK - George M. Beard distinguished neurasthenia, a nervous disease of men, from hysteria, a women's disease, as, in an earlier time, men's hypochondriasis had been distinguished from women's vapeurs. Subforms of neurasthenia came to be called phobias.
1869: Ireland - The Irish Church is disestablished.