ON THE LINE OF THE MEXICAN BOUNDARY SURVEY. 



375 



Isoclinal Observations. 



(No. 1.) 



X = 1.257 log. = 0.099335 

 y = 0.295 " = r.469822 



tang Z = 0.629513 Z - 76° 47 



(No. 2.) 



a; = 2.426 log. = 0.384353 

 y = — 0.343 " = T.535294 



tan? Z = 0.749059 Z = 79° 53' 



(No. 3.) 



