Smithsonian Report, 1894. 



Plate XLVIII. 



Tig. 1. — Arrangement used to determine by ehronophotography the movements of the lower jaw. 

 Fig. 2. — Successive ijcisitions of the lower jaw dm'ing the opening of the mouth. 

 Fig. 3.— Movements o( the lower jaw during mastication on the incisors, MA, and on the molars, MP. 

 Pig. 4. — The lower jaw drawn backward, RR, and pushed forward, P. 



