"dull and heavy," 1848, Amer.Eng., perhaps from Du. log "heavy, dull."
"a speaking, discourse, treatise, doctrine, theory, science," from Gk. -logia (often via Fr. -logie or M.L. -logia), from root of legein "to speak;" thus, "the character or department of one who speaks or treats of (a certain subject);" see lecture.