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.