AREOGRAPHY. 393 



taneously the Lick observers noted what they called streaks in the same 

 regions. These markings were as their names imply irregular or 

 indeterminate. Xor were they credited by their discoverers with 



Map 9. Lowell, 1S94 



significance beyond what the names import. They were thus of the 

 same transition character as Dawes' delineations. But Pickering drew 

 some important inferences from what he saw. From what he detected 



Map 10. Lowell, 1897. 



he concluded that the greater part of these dark areas could not be seas 

 as they had been supposed to be even by Schiaparelli. Schaeberle and 

 Barnard on this and on other grounds advanced something of the same 

 theory. 



