APPENDIX. 445 



er, Celestial Dynamics, in Correlation and Conservation of Forces, p. 

 311 ; Voyage en Scandinavie et au Spitzbery de la corvette la Recherche, 

 Geographic Physique, t. ii., p. 279 ; Annales de Chimie et de Physique, 3 e 

 Serie, t. xxiv., p. 220, 1848 ; Comptes Rendus, t. Ixi., p. 836. 



NOTE XL, page 368. 



The condensed statement in the text conveys a wrong impression. 

 There are two cones at the mouth of the Tiniere a lower, or newer, and 

 an upper, or older one. Morlot calculated the lower to be from 7490 to 

 11,000 years old, and the age of both he estimated at 96,000 to 143,000 

 years. Andrews calculates the age of the lower to be from 4265 to 4876 

 years. He makes the antiquity of the upper greatly less than Morlot, 

 though he does not find the data for a numerical statement. Human re 

 mains are only known in the lower cone ; the age of the upper is com 

 monly supposed to measure the. duration of post-tertiary time, though not 

 unlikely it reaches back into tertiary time. On this subject the reader 

 may readily refer to Smithsonian Report, 1860, p. 340 ; lb., 1862, p. 310 ; 

 Amer. Jour. Sci. [2], vol. xlv., p. 187. 



