55° 54° 53° 52° 51° 50° 49° 48° 47° ' 46° 



FiouBS 17.— Surface water temperatures tor May 27-Juiie 6, 1833. Isotherms are drawn for each 4° F. 



45° 44° 43° 



20338—34. (Face p. 34.) No. 



