394 Scitntijir IntJl'iiji nr>\ 



The extent of the field, newly studied, is s 

 in- (el. arl t-.vldhited). l!elu-een 51 in the ex 



' Capt. Abney's photographs of the 

 d A= 12,000 to think that tlie-e p»p s 

 it ion of finer lines, which can best be 



latter, I think, has on the other hand t 



