In our Mechanics' Fair, there must be not only bridges,...

In our Mechanics' Fair, there must be not only bridges, ploughs, carpenter's planes, and baking troughs, but also some few finer instruments,--rain-gauges, thermometers, and telescopes; and in society, besides farmers, sailors, and weavers, there must be a few persons of purer fire kept specially as gauges and meters of character; persons of a fine, detecting instinct, who note the smallest accumulations of wit and feeling in the bystander.