Auguste Comte
Comte, A; Martineau, H. (tr.); The Positive Philosophy of Auguste Comte; 2 volumes; Chapman, 1853 (reissued by Cambridge University Press, 2009; ) (but note that C.U.P. say "Martineau's abridged and more easily digestible version of Comte's work was intended to be readily accessible to a wide general readership, particularly those she felt to be morally and intellectually adrift", so this is not really Comte's own writings)