10 



Tuna larva survey, Acapulco-Las Tres Marias. 

 Stations 99-112 and 117-140, with the exception 

 of 100, 104, 109, 122, 133, and 139 which were 

 regular noon stations, were occupied for the 

 purpose of making zooplankton net tows, bathy- 

 thermograph lowerings, and GEK measurements 

 only. The oblique meter-net tows were made to 

 a depth of about 140 m. 



2. Incident solar radiation was measured with a 

 10-junction Eppley pyrheliometer combined with 

 a Speedomax 0-10 mv recorder. 



3. Depth of sea was continuously recorded with a 

 Precision Depth Recorder. 



METHODS 



5. Miscellaneous special stations, of which particu- 

 lars are given subsequently in this report, were 

 Nos. 38-41, 43, 44, 63-68, 97, 98, 113-116, 141, 

 142, 144, 146, 148. 



Underway Routine 



While underway between forenoon stations, 900-ft 

 bathythermograph (BT) lowerings were made every 

 three hours and were accompanied by weather obser- 

 vations. GEK observations were initiated on depar- 

 ture from Clipperton Island at 4-hour intervals and 

 were continued more or less routinely throughout the 

 remainder of the expedition. 



Continuous Observations 



The following notes refer to kinds of observations in 

 the order in which they appear in the "Station Data" 

 and subsequent sections of this report. 



Weather Observations 



A hyphen indicates a missing observation. Wind 

 force is given according to the Beaufort scale. The 

 entry "weather" is given according to the code ac- 

 companying the Bathythermograph Observation Log 

 published by the U. S. Navy Hydrographic Office. 

 Cloud type, cloud amount (cover), and sea (height) 

 are given according to codes in the Bathythermo- 

 graph Observation Log, reproduced for convenience 

 as follows: 



1. Sea-surface temperature was continuously re- 

 corded with a Taylor thermograph. 



