An organ-grinder is carrying a very large organ down the street as he passes a fellow musician with a much smaller instrument and a monkey. Wood engraving after Du Maurier.

Unknown artist

Lettering: An illustration of Darwinism. Without use, an organ dwindles; with use it increases. For instance, the organ of a grinder who, in the struggle for existence, relies entirely on his instrument, is invariably larger than that of the grinder who, in addition, uses a monkey. Most of our readers must have noticed this. Wood engravings. Du Maurier.