Sends two books detailing a new medical method that will produce "a state of health & vigour on every occasion & in every instance" and is applicable to "the entire circle of animated nature" [William Hibbert, Important discovery. Hibbert’s new theory and practice of medicine (1870) and The new theory and practice of medicine (1870)]. The volumes apply to animals and man. Subsequent books will detail the method for insects and plants.
[Letter erroneously addressed to E. A. Darwin, and forwarded by EAD to CD.]