It may, perhaps, be asked why, in many places which appear so well adapted to attract nightingales, none are found[73]. I reply that these spots may be concealed by woods or mountains, and not lie perceived by the nightingales in their journeys, or they may be quite out of their route, for they have a regular one which they never quit, because, their progress being slow, and subject to interruptions, it is requisite that they should find on their passage every thing necessary for their subsistence, and too cold an atmosphere is painful to them. It may also happen that the nightingales which formerly frequented them, may have been altogether extirpated; and as it has been said that the young always establish themselves in the district which gave them birth, it is by no means surprising that they should not be chosen, at least there are many chances against it. Rather than wait in vain for this chance, there is a means of re-peopling such places with these charming birds. It is only necessary to bring up some broods of young ones, and not let them loose in the following spring till after the period of return is elapsed; because being no longer excited by the instinct which induces them to travel, and the instinct itself being subdued in a great measure by their imprisoned education, they will not wander, but will remain and propagate, provided they are not disturbed, and will return the year following with all their family. I must not omit to say that the young intended for this re-peopling must not be confined in a cage, as they would lose the use of their wings, and run the risk of perishing the first day of their liberation. As soon as they can feed themselves, they must be allowed an entire room, in which they may fly freely, and grow strong and bold. A sort of grove should be formed of branches or small trees, and nature should be imitated as much as possible also in feeding them, by throwing to them more insects and ants' eggs than usual, to accustom them to seek for them.