[Illustration]
In order to take his trip through all the white squares only with the
fewest possible turnings, Romeo would do well to adopt the route I have
shown, by means of which only sixteen turnings are required to perform
the feat. The Professor informs me that the Helix Aspersa, or common or
garden snail, has a peculiar aversion to making turnings--so much so that
one specimen with which he made experiments went off in a straight line
one night and has never come back since.