Nothing is more important in the affairs of housekeeping than the
choice of wholesome food. Apropos to this is an amusing conundrum
which is as follows:--"A man went to market and bought _two_ fish.
When he reached home he found they were the same as when he had bought
them; yet there were _three!_ How was this?" The answer is--"He bought
two mackerel, and one _smelt!_" Those who envy him his bargain need
not care about the following rules; but to others they will be
valuable: