!• C Y The (ouf digit nu« 

 •^ ^ • loulheaii cornet 



mbe'i in (he column on lh« left give the lotifude and longitude of the 

 of each one degree quadrangle Each one degree quadrangle ii divided 

 into 30-minute quodrongiet, numbered oi m the diagrom to the right, The columni of ihaie lablai 

 gtve: A- minimum temperature, 6- maximum temperature, C number of yaon, - number of doyt. 



DEPTH ZONE 



51 



