CONTENTS 



i 



MUM 



OK A PIECE OF CHALK [1868] 1 



(A Lecture delivered to the working men of 

 Norwich during the meeting of the British 

 ;iatiou.) 



II 



THE PROBLEMS OF TEE DEEP SEA [1873] 37 



III 



ON SOME OF THE RESULTS OF THE EXPEDITION OF H.M.B. 



"CHALLENGE* " T1875] 69 



IV 

 FEAST F1871] 110 



