1902.] 



LOWELL — AREOGRAPHY. 



231 



" canals " are objects as technical in character as they are in name, 

 being quite unlike any other planetary detail. They are narrow 

 lines of uniform width, of uniform direction and following usually 



Fig. 8. 



»€RIOie5 



Map of Schiapareili, 1883-18S4. 



Fig. 9. 





Map of Lowell, 1894, 



the arcs of great circles. Tenuity, regularity and intercommuni- 

 cation are the traits which make them sui generis. Such precision 



