36 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 12 



summer. In the winter the Is. Revilla Gigedo receive a southward current 

 which comes from California, but in the late summer this is deflected 

 somewhat by the westward current from Mexico. Throughout the year 

 Baja California has a southward-tending current coming from California 

 and the north. Local eddies in several places may alter these currents near 

 shore. 



As to surface water temperatures, it appears that the warmest water 

 (27°-29°C.) lies off the coast of Costa Rica and Nicaragua in May, 

 when the water in the Galapagos area is about 25 ° ; from August to 

 November, when the Galapagos water temperature is nearer 20°-22°, 

 that off the Costa Rica and Nicaraguan coast is down a degree or two, 

 but it reaches its lowest in February (25°-27°C.), when that off the 

 Galapagos goes up to about 25° C. again. 



On the 1934 trip water temperatures were recorded at the water 

 intake by the engine-room crew; with a slight correction and converted 

 to Centigrade, they are of some interest but of course represent only local 

 subsurface water conditions. At the time the party left California (end 

 of December) the water was about 17.0° C. daily min., 22.0° C. daily 

 maximum. In the Is. Revilla Gigedo (first week of January) it was 22.5° 

 C. and 24.5° C. ; at I. Wenman in the northern Galapagos it was 25.5° 

 C, 26.5° C. (early in the second week of January). During the time in 

 the central and southern Galapagos a circuitous route was taken, and 

 there does not seem to be any close correlation with the position of the 

 vessel; it varied from 20.0° C. to 26.0° C, but, in general, the daily 

 range was about from 22.0° C. to 24.0° C. during the first ten days and 

 then was nearer 24.0° C. to 25.0° C. for ten days. The highest tempera- 

 tures of the trip were recorded on the passage up to Guayaquil, but of 

 course these do not affect the marine record. Along the coast north from 

 the R. Guayas they varied from about 23.5° C. min. to 27.0° C. max., 

 but were higher about the Is. Secas, reaching 26.0° C. min., 28.0° C. 

 max. during the last week in February. The writer did not secure the 

 data northward from this point. 



