TABLE OF CONTENTS (Continued) 



Page 



157 . Certain Factors which Determine the Ice Abundance of the Arctic 



Ocean 459 



158. Astronomical Factors 459 



159. Geological Factors 461 



160. Climatic Factors 462 



161. Synoptic and Oceanological Factors 464 



162. Warming of the Arctic 470 



CONCLUSION 477 



BIBLIOGRAPHY 479 



