136 



posed to attain the seventh, or, in extreme cases, even a greater 

 number of teeth, without the least change in the laws that govern 

 this process. 



Cuvier states the number of molar teeth, in the Mastodon 

 giganteus, as four in each branch of each jaw ; * the formula 

 being : 



Incisive, f ; Canine, § ; Molar, |. 



The late Dr. Godman, of Philadelphia, discovered two addi- 

 tional tusks in the lower jaw of the male ; t so that his statement 

 of the dental system would be. 



Incisive, J ; Canine, § ; Molar, f . 

 Dr. Hays, of the same place, discovered a fifth | molar tooth 

 in each branch of the jaws, or 



Incisive, f ; Canine, % ; Molar, |g. 

 He suggested the probability of the existence of a sixth molar ; 

 and Dr. Warren § informs us, that subsequent discoveries have 

 confirmed this suggestion ; the teeth known to him being, 



Incisive, f ; Canine, J; Molar, |f. 

 He further informs us, that numerous specimens support the 

 opinion, that the number of molar teeth is twenty-four, and no 

 more. 



But it has been very clearly shov^n above, that, at least in one 

 case, there was one more molar tooth, being the seventh, and 

 that the system, as now determined, is as follows : 

 Incisive, f ; Canine, % ; Molar, ||. 



Mr. Charles Stodder read sonfie extracts from an article 

 in the American Journal of Science and Arts, Vol. XIX. 

 p. 55, (taken from the Comptes Rendus, June 2, 1854,) 

 entitled, " Report to the Academy of Sciences, Paris, on 

 the Researches relative to Earthquakes, of M. Alexis Per- 

 rey ; by the Commission M M. Liouville, Lame, and Elie de 

 Beaumont, reporter." 



* Ossemens Fossilcs. Tome I. 1821. 

 t Tr. Am. Phil. Soc. New Ser. III. p. 478. 1830. 

 t Tr. Am. Phil. Soc. New Ser. IV. p. 317. 1831. 

 (j The Mastodon, &c. p. 66. 1852. 



