CHAPTER VII.

Uncle Thomas tells about the Migrating Instinct of Animals.--Of the House Swallow of England; and the Esculent Swallow, whose Nest is eaten by the Chinese.--He tells also about the Passenger Pigeon of America; of the Myriads which are found in various parts of the United States; of the Land-Crab and its Migrations, and of those of the Salmon and the Common Herring 144