Study of Insects. The life of forest insects, their damage or benefit, soon became the favorite study of many practical foresters. The joint efforts of numerous individuals succeeded in elevating forest entomology to a respected scientific discipline within a few decades, making it a common knowledge among all educated foresters. The situation was different for those plant diseases that could not be attributed to animal damage. Their study was reserved for more recent times, as it was only after botanical science, with its main tool, the microscope, gained a clearer insight into the normal structure and life processes of plants—especially with the study of fungi being advanced in recent decades by a number of outstanding researchers—that the investigation of...