ERUPTION OP THE PERMANENT TEETH 133 



(10, 11) upper lateral premolars and upper canines, (12) lower 

 lateral premolars, (13) lower second molars, (14) upper second 

 molars, (15) lower third molars, (16) upper third molars. 



The order of eruption of the individual teeth in the Filipinos 

 is the same as the above except that the lower first molars and 

 the lower median incisors erupt at the same time, the upper 

 median incisors and the upper first molars change places, the 

 lower canines erupt before any of the premolars, and the upper 

 canines erupt at the same time' as the upper median premolars. 



If these results are compared with those obtained from the time 

 at which 50 per cent of the teeth are erupted little difference 

 will be found. The order of eruption in the sex-race groups is 

 the same, and the order of eruption of the types of teeth is the 

 same, but the order of eruption of a few of the individual teeth 

 is slightly different. This is manifest chiefly in the relative time 

 of eruption of the first molars and median incisors, and of the 

 canines and premolars. The meaning of this is that the first 

 molars and median incisors are intimately related in time of 

 development, if they are not synchronous, and the same is true 

 of the canines and premolars. In either case the canines are 

 more precocious in the Filipinos than in the Germans and 

 Americans. 



4- Review of the literature and discussion 



We may arrange the teeth in the order found in their eruption 

 among the German and American children of Ann Arbor taking 

 the time at which 50 per cent have erupted and with this compare 

 records for the French by Magitot-Broca (12, 13, 36, 37, 38, 39), 

 Mayet (40), and Cherot (14), for the German by Welcker (51), 

 and for the English by Livy (35) . 



It may be said that the time of the eruption of the teeth as 

 given by Cherot for the French is almost the same as that of the 

 Ann Arbor German and American children, or only a little earlier, 

 whereas those of Magitot-Broca, and Mayet for the French are 

 earlier, and those of Welcker for the Germans are later than those 

 for the Ann Arbor children. The records of Welcker are only 

 slightly later than those for the Ann Arbor German boys 



