98 BUREAU OF AMERICAN ETHNOLOGY [bull. 34 



ject above this age. While the average age among whites at which 

 the eruption of the first teeth is completed is about 2f years (D.),it 

 appears that in the Indian child this occurs earlier. 



The whole subject of the first dentition may be briefly summarized 

 thus : 



All the teeth of the fii'st dentition appear in the same order in the 

 Indian child as in the white. 



All the incisors erupt on the average at about the same age in the 

 two races. 



The appearance of the first premolars and the canines seems to be 

 somewhat belated in the Indian. 



The eruption of the posterior premolars and the completion of the 

 first dentition are accomplished earlier in the Indian than in the 

 Caucasian. 



Between the end of the first dentition and the appearance of the per- 

 manent teeth there is in Indians as well as in whites a considerable 

 interval, after which appears the first molar. The eruption of the 

 molars takes place during the latter part of the fifth year (D.). An 

 Apache girl of 5 years and 8 months had all four of these molars, and 

 the same is true of the next and last Apache child of known age, 

 namely, 6 years 6 months and 20 days. In the Pima the youngest 

 child with all four first permanent molars erupted was a girl of 4 

 years and 11 months; all four of the teeth were present in every 

 child of 6 years and 4 months. 



The permanent median incisors appear in whites at from 6f to 71 

 years, the lateral ones at from 7f to 8h years (D.). A Pima boy of 6 

 years 9 months and 20 days had both lower median incisors; one 

 of 7 years 4 months and 7 days had the left upper lateral tooth, but 

 none of the other three, and all the children from S years onward 

 had, with one exception, the whole set of permanent incisors. It is 

 plain that so far as the eruption of these eight teeth is concerned 

 there is little if any difference between whites and Indians. 



The permanent canines appear in whites during the twelfth year 

 (D.). Both of these teeth in the lower jaw were present in a Pima 

 girl of 10 years 6 months and 11 days, and all four were erupted in 

 another Pima girl of 10 years and 8 months; they were just appearing 

 in a girl of the same tribe of 12 years and 1 month while none were out 

 in the case of her sister, but these two children were twins and not 

 robust. 



The permanent bicuspids appear in whites, the anterior during the 

 eleventh and the posterior during the twelfth year (D.). The ante- 

 rior ones were all found in a Pima girl of 10 -years 6 months and 11 

 days and in another of 10 years and 8 months, and each of these 

 children had also (in one just appeared) the left upper posterior 

 bicuspids. In the twins before mentioned (of 12 years 1 month and 



