A text-book of geology. Part 1. Physical geology. Part 2. Historical geology / A text-book of geology. Часть 1. Физическая геология. Часть 2. Историческая геология

In 1915, when the first edition of this text-book appeared, the author had had ten years' experience in teaching Historical Geology in the Sheffield Scientific School of Yale University. Since then he has continued his interest in the subject, teaching it until 1920, and has made almost daily annotations in his table copy of the first edition concerning the newer facts as they appeared in publications. It soon became a perplexing problem to know what to eliminate so as to keep the book within bounds, as one intended for  eginners in Geology rather than for matured geologists. A few teachers present Historical Geology in 15 hours, most of them take from 28 to 35 Tiours, and now there is a strong tendency to extend the lectures and laboratory to 45 hours. Moreover, the fact that many American college students taking a year's work in Geology have had no preparation in Zoology or Botany makes it necessary to include in the book some description, however brief, of the fundamental structures of living plants and animals. To cut the dilemma arising from such diverse needs on the part of the teachers, the author has concluded, after seeking advice from many who are presenting the subject in our colleges, to include in the book too much material rather than too little. Accordingly the new edition is larger by some 80 pages. For the 45-hour course the book is about the right length, and it is thought that the instructors of the shorter courses will know best what parts to eliminate. <...>