CHAPTER 2.
Commence journey up San Juan river.—Palms and wild canes. —Plantations.—The Colorado river.—Proposed improvement of the river.—Progress of the Delta.—Mosquitoes.—Disagreeable night. —Fine morning.—Vegetation of the banks.—Seripiqui river. —Mot-mots.—Foraging ants: their method of hunting.—Ant-thrushes. —They attack the nests of other ants.—Birds' nests, how preserved from them.—Reasoning powers in ants.—Parallel between the mammalia and the hymenoptera.—Utopia.