CONTENTS. 



Introduction (Extracts from Dr. 

 Alexander Agassiz's prelimi- 

 nary reports bearing on the 



bottom-deposits) 7 



First Expedition 7 



Second Expedition 9 



Third Expedition 9 



Fourth Expedition 14 



Bottom Samples collected during the 

 fourth expedition of Dr. Alex- 

 ander Agassiz, 1904-1905 ... 17 



Types of Deposits 19 



Pelagic Deposits 19 



Terrigenous Deposits 20 



The Mineral Constituents observed 



in the different deposits ... 21 



Methods used for determination 27 



Manganese Nodules 28 



Palagonitic Tuffs 35 



Hardened Deposit 37 



Phosphatic Concretion 38 



Sharks' Teeth and Cetacean Bones 38 

 Detailed descriptions of the Deposit- 

 Samples 40 



Bottom Samples collected during the 

 third expedition of Dr. Alex- 

 ander Agassiz, 1899-1900 ... 80 



Page 

 Detailed Descriptions of the Deposit- 

 Samples 81 



Manganese Nodules 143 



The Depths of the Pacific Ocean 149 

 Distribution of Marine Deposits 



IN the Pacific Ocean .... 153 



I. Red Clay 154 



II. Globigerina Ooze 154 



III. Diatom Ooze 155 



IV. Radiolarian Ooze 155 



V. Pteropod Ooze 155 



VI. Coral Mud and Sand .... 156 

 VII. Other Terrigenous Deposits . 166 



Percentage op Calcium Carbo- 

 nate in the Deposits cover- 

 ing the floor of the Pacific 

 Ocean 157 



General Remarks and Conclu- 

 sions 160 



Appendix. Notes on the examination 

 of materials from Station 2 

 (1899-1900 cruise) and Station 

 4719 (1904-1905 cruise) by Dr. 



W. A. Caspar! 165 



A. Palagonitic Tuff 165 



E. Red Clay 168 



Explanation of the Plates .... 171 



