DEDICATION 



to Henry K. White, to whom I owe a certain 

 curiosity about the workings of nature and whose 

 first lessons in scientific thinking and procedure 

 are the foundation upon which all of my work has 

 since been built, 



to Mary P. White, to whom I owe patience and 

 perseverance and what humility I may claim, to 

 carry through the tasks at hand, 



to Caroline D. White, whose inspiration and 

 constant help have supported me at many a diffi- « 

 cult pass, and 



to little Christopher John and Jonathan Peter 

 for whom, after all, all things in heaven and earth 

 are done, 



this little volume is humbly dedicated. 



