ABSTRACT
In the introductory part of this brochure, Dr. A. Braun says that, “As the history of the civilization of the human race has its dark side in the development of many obstinate social evils which accompany the march of advancing civilization, so also has horticulture and agriculture, together with the bright, their dark side. There are certain diseases to which plants, in the state of cultivation show themselves to be more obnoxious than when they are in their natural localities, and subject to the original conditions requisite for their flourishing. That this dark side fully deserves the attention of the gardener and of the farmer, is obvious, from the incalculable evils that ensue upon the mysterious and unexpected appearance of one of these vegetable plagues. The more difficult it appears to investigate the causes of these diseases, and to discover means by which they may be arrested or prevented, so much the more are they worthy of profound study.”
