TABLE OF CONTENTS. 



Page. 



Introduction 9 



General considerations and previous work lO 



Description of apparatus 13 



Culture media and methods 19 



The investigation of samples of sea- water taken off Port Royal, Jamaica 21 



The investigation of samples of sea-water taken around the Dry Tortugas 24 



The investigation of samples taken from a point 70 miles west of Ushant Island, France 27 

 The investigation of samples from the Marquesas Keys, Florida, and experimental pre- 

 cipitation of calcium carbonate by bacterial agency 29 



Some considerations on the physiography of the Tongue of the Ocean and Andros 



Island 31 



Bacterial investigations in the deep water of the Tongue of the Ocean 34 



Hydrographic observations in the Tongue of the Ocean 37 



Bacterial investigations of the chalky mud flats which are being deposited to the west 



of Andros Island 41 



Conclusion 44 



8 



