CHAPTER IV. May, 1851 (ÆT. 33) 186

Purity—An Optical Illusion—A Mountain Tarn—Experiments in Living—The Caliph Omar—The Harivansa—The Taming of Beasts and Men—The Study of Nature—False Teeth or a False Conscience—Taking Ether—Moonlight—Notes from Michaux—Vegetation and Human Life—The Development of the Mind—The Mind and its Roots—Man our Contemporary—Names—Wild Apples and their Names—An Inspiring Regret—Medical Botany—The Designs of Providence—True Sites for Houses—The View from the Wayland Hills—An Organ-Grinder—Materia Medica—Tobacco—More Names for Wild Apples.