RQ' 58° 57° 56° 55° 54° 53° 52° 51° 50° 49° 48° / 47 



^X43V 



55° 54° 53° 52° 51° 50° 49° 48° 47° 



FiGUBE 16.— Surface water temperatures for May 6-17, 1833. Isotherms are drawn for each 4° P. 



46° 45° 44° 43° 



20338—34. (Face p. 34.) No. 5 



