ERRATA AND ADDENDA 

 Page Line 

 31 5 For "shipjack" read "skipjack" 



33 Fig, IB The insert should be labeled as follows; 



37 2 For "vetebral" read "vertebral" 



55 3 For "north and west" read "southwest" 



75 28 The symbol for number of poles is a lower-case Lj 



not the figure one^ 



75 30 For "J- " read " ^ " 



73 35 For "Here is a constant o" read "a here is a 



constanto*' 



