PREFACE. 



received from Dr. Robert Allyn, president of the 

 Southern Illinois Normal University, not only in the 



8J 



] - 



^xj^QgiPI 

 ^^^^ffi^.>> I 



^\f W-* 



,o4 ?V ^' J ' / 



. =^ ? >i^ 



^-> 'X- 33 



ii^i'-i 



^ii 

 *^^ 



00 



y-vrc= 



M 



preparation of this volume, but in the interest of science 

 generally. Dr. S. H. Peabody, regent of the Illinois 

 Industrial University, also has thanks for revising a list 



