—, on animalcules in snow, xviii, 56.
—, on the Hessian fly, xxii, 71, 155.
Museum at Geneva, in Switzerland, iv, 199.
— of the Vatican, iv, 380.
— of Paris, iv, 381.
Museums of Natural History, when established in England, xxxvii, 143.
Mushrooms, gas from, xvii, 174.
Musical intervals, J. Farey, ii, 65.
— temperament, essay on, A. M. Fisher, i, 9f, 176.f
— tones produced by magnets, C. G. Page, xxxii, 396; xxxiii, 118; xlviii, 401.