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776 DARWIN (CHARLES)

L.S. (with autograph date and salutation), 3 pages, 8vo, Down, Beckenham, Kent, 6 June, no year, to an unnamed correspondent [possibly Dr. Michael Foster], thanking him for and commenting on a paper (". . . It tells me exactly what I especially wanted to know, & what I cd not find out in any of the books which I possessed, namely, how far our knowledge at present extended, & where we were ignorant . . ."), asking him to come to stay on Sunday night and describing his own ill health (". . . I suffer from a strange state of weak health, which prevents me from talking with any one, & I am liable to have bad days when I can hardly converse at all . . .")