REVIEW AND RECOMMENDATIONS. 19 
SUMMARY. 
We have shown that the recent physical history of the region is legibly recorded 
in glacial sculpture and moraines, in orogenic movements, in valley cutting and 
terracings, in lake expansions, and in the building up of the plains, and we have 
made some progress in correlating these events. 
We have also found full confinnation of the statements as to a progressive desic- 
cation of the region of long standing, which has from a remote period continually 
converted cultivable lands into deserts and buried cities in sands. 
We have found, widely distributed, great and small abandoned sites of human 
occupation, with evidences of great antiquity. 
We have reason to think that a correlation of these physical and human events 
may be obtained through continuance of the investigation, and that archeological 
excavations will throw light on the origin of Western and Eastern civilizations. 
