ANN A A | Be 2 9-02 Bismuth f Bi 83 20900 Boron B 5 i 3 | 1,107 | 0-7 9 | 2,022 | 1-0 3 | Fuel A.S v 13 E = ee me alice Cl he bc ier LT loi ie he OO ibe de ee FO eee CCITT Ti LE oe eai nannaa Eskdalemuir Wintel amma Vear =- Summer asses Fic. 1.—Graph comparing the progress of the Khaldian or Urartaean empire of Van, itself depending upon an eight- hour day as the study of structure; their use, however, it must have been developed. The gradual revelation of the structure