Gag and editorial cartoons usually consist of a single panel, often incorporating a caption or speech balloon. Definitions of comics which emphasize sequence usually exclude gag, editorial, and other single-panel cartoons; they can be included in definitions that emphasize the combination of word and image. Gag cartoons first began to proliferate in broadsheets published in Europe in the 18th and 19th centuries, and the term "cartoon"[h] was first used to describe them in 1843 in the British humour magazine Punch.