Pr ef ae e. 



The preparation of the normal tables and plates on Nedurus was begun several years ago by 

 Professor C. O. Whitman but on account of unavoidable circumstances the werk was delayed. It was later 

 taken up by Professor Eycleshymer upon the Suggestion of both Professor Whitman and Professor Keibel. 

 While Professor Whitman has not directly participated in the later work, he has furnished the senior 

 author with material and Information without which it would have been impossible to complete the work. 

 In the completion of the work the senior author has been fortunate in having the able Cooperation of 

 Professor James M. Wilson. 



