Author: San Diego Society Of Natural History

Publisher: Forgotten Books

Published: 2017-12-11

Total Pages: 432

ISBN-13: 9780332644752

Excerpt from Transactions of the San Diego Society of Natural History, Vol. 5 By way of summary, it can be said that the life of the Sierra San Pedro Martir in Lower California has been strongly affected by the geographical position of these mountains between two areas of varying desert character and between two not distant bodies of water of large expanse, each having a different temperature. The influences thus created, in addition to the naturally barren soil of the region, tend to replace the effects of altitude with the effects of aridity. Certain forms of birds and mammals are thus sustained, and certain forms eliminated. Finally, a small, isolated mountain area, just as an island, develops biological variation in species more rapidly than do areas of greater extent. 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.