Preface-Published in 1922-This book illustrates the modern trend toward unity in all of these ways. First, it is a companion volume to Earth and Sun. That volume is a discussion of the causes of weather, but a consideration of the weather of the present almost inevitably leads to a study of the climate of the past. Hence the two books were written originally as one, and were only separated from considerations of convenience. Second, the unity of nature is so great that when a subject such as climatic changes is considered, it is almost impossible to avoid other subjects, such as the movements of the earth’s crust. Hence this book not only discusses climatic changes, but considers the causes of earthquakes and attempts to show how climatic changes may be related to great geological revolutions in the form, location, and altitude of the lands. Thus the book has a direct bearing on all the main physical factors which have molded the evolution of organic life, including man. *** QUALITY DIGITIZED BOOKS ***This Ebook can be placed on the SDCARD with Android 2.2 and above.This is the full length digitised ebook version of a classic book and is supplied by Digi-Media-Apps. Each book is packaged with an advanced EBOOK reader. Simply download the App and read the book