X PREFACE. 



nature or the names of the logical processes; 

 but as far as it lay in my power I have avoided 

 setting my foot on controversial ground. There 

 are in the book, no doubt, many errors in 

 detail, but it is hoped that no serious ones have 

 crept in. 



I wish to thank Professor Francis Darwin of 

 Cambridge, England, and President David Starr 

 Jordan of Stanford University, both of whom 

 made important suggestions, and Professor H. 

 B. Lathrop of Stanford University, who care- 

 fully revised the manuscript. 



FRANK CRAMER. 

 MANZANITA HALL. 



