TETHERED by ill-health to the South of England, I have, since '89, spent the greater part of the summer of each year in a country house--mostly that of some gentleman-farmer whose family and surroundings fulfilled the needful conditions: one being the presence of young people. Taking, in my daily drives, two ladies as companions, and being generally unable to bear continuous conversations, I put a check on this by asking one or other question not to be answered without thought. The practice thus originated became established, and it has since been my habit to set problems, partly by way of gauging the knowledge of young people and partly by way of exercising their reasoning powers. One of the simplest, which was sometimes answered, is--How happens it that sheep, rabbits, and hares have their eyes on the sides of their heads, while cats and dogs have their eyes nearly in front? Of others, to which the replies are less obvious, and to most of which no answers have been forthcoming, here are a few.
How is it possible for a lark, while soaring, to sing for several minutes without cessation?
What is the reason that in hilly districts the roads