CONTENTS. 

 a* 



Page. 



Introduction 211 



Temperatures and heat budgets 211 



Surface and bottom temperatures 212 



Thermal regions 213 



Summer heat income 213 



Distribution of heat 218 



Direct work 219 



Distributed work 221 



Subtraction curves 221 



Heat and work as measured at depth 222 



Absorption of sun 's energy 223 



Work of the sun in distributing heat 232 



Plankton 235 



Methods 23s 



Net plankton 236 



Phytoplankton 236 



Zooplankton 236 



Nannoplankton .■ 241 



Plankton tables 243 



Bottom fauna 250 



Literature cited 252 



210 



