viii CONTENTS. 



PAGE 



GENERAL DIEECTIONS 25 



Purification ^5. 



Occasional Death 2T 



Instruments ih. 



Artificial Aeration 28 



Evaporation 30 



Cleansing the Sides 31 



Turbidity 34 



Food 37 



INSTRUCTIO^^I'S FOR COLLECTING 38 



Time ib. 



Implements 39 



Collecting Sea-weeds 40 



Collecting Animals 45 



Dredging 47 



Towing ib. 



