114 EGBERT BENNETT BEAN 



Data: 2221 school children 



630 Filipino boys 

 776 146 Filipino girls 



322 German boys 

 628 306 German girls 



407 American boys 

 817 410 American girls 



2221 Total 



INTRODUCTION 



The records on which this study is based were made in 1906, 

 1907 and 1908 and have lain fallow for more than five years, be- 

 cause of excessive teaching duties and lack of library facilities. 

 However, after an extensive survey of the literature I have come 

 to the conclusion that no other study of its kind has ever been 

 made, except that of Hrdlicka on the North American Indians 

 (31), and it was through the initiative of Dr. Hrdlicka that this 

 work was undertaken. Observations on the teeth of many people 

 have been made from time to time but no extensive detailed ob- 

 servations have ever before been published, not even of Euro- 

 peans, and no absolute standards have been established as to the 

 time of eruption or extent of decay in males and females and 

 from, the standpoint of race. This study is an attempt in that 

 direction, but leaves much to be desired, especially as the num- 

 ber of Filipinos examined at each age in the early years is but 

 small. 



MATERIALS 



During the school term of 1906-07 I examined and measured 

 every available child in the public schools of Ann Arbor. This 

 was made possible through the cooperation of Dr. McMurrich, 

 and the superintendent of schools and the teachers who showed 

 commendable zeal in furthering the work. The teeth of the 

 children were examined by Dr. Bunting who also assisted me in 

 making the records. Two groups of children were segregated, 

 one of American parentage solely, the other of German, or Ameri- 



