Struggle for Existence

I wish it were possible to mention by name many 0 those who have helped me among the more than thre thousand Of my students and comrades who hav studied and criticised large portions of these discus sions in advance sheets. It had been my purpose to d so, but the number has SO outgrown all expectations that particular as to make it entirely impracticable They are found in every state in the Union, in all th provinces of Canada, in England and on the Continent in India, Japan, New Zealand, Australia, the Philip pines, Hawaii, Alaska, Mexico and Cuba. Their in quiries, suggestions and encouragement and, finally their assistance in publishing this volume, have place me under lasting obligations to them all.