John Stevens Henslow (1796-1861), a student of Adam Sedgwick, became Professor of Mineralogy at Cambridge in 1822. He soon moved to a chair in Botany, and became a teacher and mentor to Charles Darwin. This book on mineralogy was first published in 1823. It was intended to save time in class by providing an easily accessible reference to the composition of various minerals according to the principles of atomic theory, which was then entering the scientific...