Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: meadows of an open woodland formation in Skabholm. The physical and chemical nature of the soil in the various locations was carefully determined but no measurements of the amount of soil- water seem to have been made. Of particular interest, in view of the methods of the present paper, are the exact measurements of light and their direct connection with assimilation, transpiration and leaf structure. The conclusions in this respect are the following: plants in the leafless thickets of the springtime assimilate as vigorously as those in the sunny meadow; reduced light decreases assimilation even to the point of the complete absence of starch formation; plants which mature in continually decreasing but not very weak light, have a less completely developed assimilative tissue than those plants which obtain a great deal of light in the spring but are deeply shaded during the summer; shade-plants transpire less than sun-plants, and of the latter those with well developed palisade transpire more than those with less differentiation in the leaf structure. III. Physical Factors The physical factors of a habitat are either climatic or edaphic. The former are those of the atmosphere, e. g., light, temperature and humidity, while the latter are connected with the soil, viz., water, chemical and physical composition, and temperature. Of climatic factors light is by far the most important in its relation to the plant. Some of the light rays are reflected from the surface of the leaf and thus rendered ineffective. The waxy coating of some leaves serves the purpose of increasing the amount of reflected light and so preventing over-illumination. Other of the light rays are transmitted, and it is not known what effect they may have in transmission. Effective light rays are those which are a...

Excerpt from Transactions of the American Microscopical Society, Vol. 36: July, 1917 Contribution from the Entomological Laboratory, Kansas State Agricultural College, Woods Hole, Mass. Owing to the fact that the known marine spe cies of that locality intermingle in the same habitats, and that some of them have been reported from both f resh-water and terrestial conditions, it was necessary to identify the enchytraids from the various collecting grounds about Woods Hole in order to avoid error in handling immature individuals and to insure accuracy in the identity of the materials used. In spite of the fact that two species occur in great abundance in the environs of Woods Hole and certain other parts of the Atlantic Coast, they have received scant attention from workers in any of the fields of zoology. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.

Excerpt from Transactions of the American Microscopical Society, Vol. 24: Twenty-Fifth Annual Meeting Held in Pittsburg, Pennsylvania, June 27 and 28, 1902 Prevention of the Pedetic or Brownian Movement in Milk or other Liquids with Minute Objects in Suspension, by Simon Henry Gage. Stereoscopic Photomicrography with High Powers, by F. E. Ives, with Plate I. The Structure and Classification of the Phycomycetes, with a Revision of the Families and a Rearrangement of the North American Genera, by Charles E. Bessey, with Plate II. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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.

Excerpt from Transactions of the American Microscopical Society, 1918, Vol. 37: Published Quarterly by the Society SO much has been said about insects since the War began that it is, I think, advisable that some attempt should be made to sum marize our knowledge of the more important insect-borne diseases and their vectors. While insects have long been suspected of being responsible for the transmission Of serious diseases, it may be said that practically the whole of our knowledge of insects in this role has been acquired within the past twenty years. SO rapidly, how ever, has the charge of this offence been made out against them that, although it is common knowledge they have been proved guilty, it is not generally realized upon how many counts the verdict rests. It has lately been my good fortune to give class instruction for the War Office to officers of the R. A. M. C. Who are proceed ing to the East, and, in order to bring home to my audience the importance of the connection between insects and disease, I have compiled the tables' which I now publish. These can in no way claim to be complete, but merely present the more important insect bome diseases, including important human diseases that on certain grounds are suspected of having insect vectors. With these tables I also publish one (table VI) which includes the chief insects and acarina that are directly the cause of disease in man and his domestic animals. TO complete the list of insect-transmitted diseases would demand the consideration not only of other mammals as hosts, but also Of avian and reptilian hosts. In the present instance this would be to carry the subject beyond general interest, but it must be remembered, therefore, that, long as the present list Of charges is, insects are not here arraigned on all the counts that might with justice be preferred against them. Reprinted from Journal of Tropical Medicine and Hygiene, Sept. 15, 1917; xx, 18. During the last few years medical entomology has been rapidly establishing itself an an invaluable branch of preventive medicine, and with the outbreak Of the present War a great deal of interest and study has been devoted to this subject in Europe, notably in connection with the transmission of typhus fever by lice, and the dissemination Of bacteria and other organisms by ies. Moreover, the importance of insect vectors has been generally realized, and many of the astonishing interactions between pathogenic micro organisms and certain arthropoda have become popular knowledge. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This 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."