were collected and analyzed on the run 

 between 32°30'N. , 170 o 30'E. and Midway 

 Islands. The results are tabulated in the 

 station data, table 4, and BT log sheet sum- 

 maries, table 5. The profiles are given in 

 figures 95 to 99 and the surface distribution 

 in figure 100. Only the plots on the 2b. and 

 26.8 sigma-t surfaces were plotted (figs. 

 101 and 102), since the range on the 25.2 

 sigma-t surface was only from 0. 19 to 0.40 

 ug at. /L. 



5. Bathythermograph lowerings were made at 

 each oceanographic station and at approxi- 

 mately 30-mile intervals between stations. 

 The observations (Log Sheet "B") are sum- 

 marized in table 5; figures 63 to 68 show the 

 temperature profiles and surface tempera- 

 ture distribution drawn from the BT data. 



6. A continuous record of the surface water 

 temperature was made by means of a re- 

 cording thermograph. 



7. A 30-minute, 0-100 m. oblique plankton haul 

 with a 1-meter net of 30XXX silk grit gauze 

 was made at each oceanographic station ex- 

 cept at station 14. This haul was omitted 

 because of rough seas. The plankton data 

 will be summarized in another report 

 (Jones MS. ). 



8. Twenty-six collections were made with 6- 

 and 10-foot Isaacs-Kidd mid-water trawls. 

 An analysis of these collections will be pre- 

 sented in a separate report. 



9. Night-light collections were attempted at 

 oceanographic stations t> 1 and 66. At station 

 61 only 12 sauries were taken and at station 

 66 there was no catch. 



Secondary Missions 



1. Five lines were trolled during daylight 

 hours. The results have been summarized 

 by Shomura and Ctsu (1956). 



2. The wheel watch maintained a record of all 

 tuna schools, bird flocks, and scattered 

 birds and mammals sighted. 



3. Synoptic weather observations were made 

 daily at 0000, 0600, 1200, and 1800 GCT; 

 the resulting data are summarized in table 

 6. In addition, certain standard weather 

 observations accompanied all BT lowerings. 

 The anemometer failed on February 8, 1955, 

 and the winds recorded after 1640 GCT on 

 that date were estimated. Five storms with 



winds of moderate gale force (28 knots) or 

 greater were encountered. They varied in 

 duration from 4 to 2 1 hours. The storm 

 tracks during the months of the cruise are 

 shown in figures 103 and 104. 



4. A bait-fish survey was conducted on Midway 

 and Laysan Islands. The results will be 

 summarized in a separate report. 



5. A bird count was conducted on Laysan Island 

 with emphasis on the rare Laysan Duck. 

 These data will alsobe covered in a separate 

 report. 



6. A count was made of the Hawaiian monk 

 seals on Midway Islands and on Laysan 

 Island. A total of 26 seals were counted on 

 Midway Islands. On Laysan Island there 

 were 105, consisting of 67 adults (200 lbs. 

 or over), 19 juveniles (50-200 lbs. ) and 19 

 pups (about 25 lbs.). One of the pups was 

 born on the day the survey was made 

 (February 10, 1955). 



Form and Location of Field Data 



The following records were kept on Hugh M. 

 Smith cruise 27; they are on file at POFI except 

 as otherwise noted: 



Barograph records 



Bathythermograph Log Sheet "B" (duplicates 



at Scripps Institution of Oceanography) 

 Bathythermograph slides (Scripps Institution 



of Oceanography) 

 Chemical data sheets 

 Deck log 



Flowmeter and sampler calibration log 

 Light fishing station log 

 Occurrence of tuna schools, birds, and 



aquatic mammals 

 Original oceanographic data, Log Sheet "A" 

 Plankton log 

 Scientists' log 



Tuna morphometric sheets - short form 

 Standardized surface trolling data sheets 

 Thermograph records 

 Thermometer arrangement forms 

 Track charts 

 Trawling log 

 USWB Form 12 10F (original at U. S. Weather 



Bureau Records Center, Asheville, N. C. ) 



HUGH M. SMITH CRUISE 30 



The description of the cruise, methods, and 

 the observed data have already been published 

 (McGary, Jones, and Austin 1956). Only the 



