Fishery Industries of the United States, Sect. III. 



OCEAN TEMPERATURE CHART No. 20 



By RICHARD RATHBUN. 



Station: Thatcher's Island Lights, Massachusetts. 



Repitsenting, by meaas oCcurves, the temperature of the air from 1881 to 1883, inclusive^ and of the water at the surface from 



1881 to 1883, inclusive, Tedaced to means of ten days. 



EXPLANATION" OF THE CURVES: 1881, 1882. - - 1883. 1884, T885. 



(Issued in 1886.) 



