Stigmonose

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Excerpt from Stigmonose: A Disease of Carnations and Other PinksIn addition to the above description, these translucent dots may be divided into three classes, representing three forms of the disease, which differ slightly from each other in general appearance and behavior. The first and most common form corresponds with the above description. The translucent dots increase more or less rapidly, according to the age of the leaf, until finally they reach a diameter of one to several milli meters, and Often coalesce. The second form is characterized by the appearance of very small spots, scarcely visible to the naked eye, but easily detected when the leaf is held up to the light and examined with an ordinary hand lens. These small Spots are exceedingly numerous, but in their further development, even on young leaves, scarcely ever reach a diameter of more than half a millimeter. The third form resembles the first in extent of development, but instead of being round, the spots are elongated and irregular, and the affected plants more or less distorted.Dr. Arthur said that in his earlier study of the disease no cause, either parasitic or nonparasitic, could be found to account for the ditti culty. The eye, either unaided or by the assistance of the microscope, All succeeding quotations from these authors are from this bulletin.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.