DREDGING AND HYDROGRAPHIC RECORDS. 5 



Lieut. Commander J. J. Hannigan, U. S. N., made commanding 

 officer on July 1, 1915. Mr. Johnston resigned from the position of 

 naturalist October 18, 1917, to enter military service and was suc- 

 ceetled by E. P. Rankin December 1, 1917. 



On the return of the vessel to the Bureau of Fisheries, June 23, 

 1919, Lieut. Commander C. D. Cochran, C. G. S., was in command, 

 and he was succeeded on October 24, 1919, by Commander L. J. 

 Wallace, U. S. N. Mr. Rankin resigned from the position of naturalist 

 July 15, 1920. 



EXPLANATION OF TABLES. 



In Bureau of Fisheries document No. 741 the last Albatross 

 dredging station was D. 5672 and the last hydrographic station H. 4937. 

 The accompanying list gives the station numbers and the various 

 investigations conducted by the Albatross from that point to the 

 present time. 



Lower California (Gulf of Oalifornia) cruise ffi- f gggZg 4953 



Alaska, 1911 h". 4954-H'. 4955 



Biological survey of San Francisco Bay « (1912-13) . .j^- 495^2 535Q 



Biological survey of San Francisco Bay (March, 1914) H. 5.351-H. 5365 



Halibut investigation, 1914 H. 5366-H. 5774 



Halibut investigation, 1915 H. 5775-H. 6408 



Atlantic cruise south from Norfolk, 1919 C20001 to C20040 



Atlantic cruise north from Norfolk, 1920 C20041 to C20130 



Atlantic cruises surface temperatures while under way, 1919-20 



Prior to 1919 those stations at which the main object was the col- 

 lection of specimens by dredging or trawling were designated as ''D" 

 stations and those where hydrographic and plankton collection was 

 the object as ''H" stations. Beginning in 1919 a single series of 

 numbers is used and the stations at which collections are made are 

 designated by the prefix letter ''C," as ''C20001." 



The ''Position" of a station is that point occupied by the vessel 

 at the beginning of a haul or set of observations as determined by 

 the navigator and plotted by him on the chart. On the halibut 

 cruises of 1914 and 1915 the bearings and distances were worked out 

 from the chart after the stations, indicated by small circles, had been 

 plotted in by the navigator. In view of the fact that a large per 

 cent of the stations on these two trips were within sight of land and 

 that runs inshore were frequently made to check up the bearings, 

 the percentage of error is very small. All bearings are ' ' true " unless 

 otherwise indicated. The charts used were either U. S. Hydro- 

 graphic Office or U. S. Coast and Geodetic Survey, as indicated. 



Where two figures are given under the heading "Time of day," 

 "Depth," and "Temperature," the first represents the beginning and 

 the second the end of the series of observations. Where one figure 

 is given, it represents the beginning of the series of observations. In 

 the case of the halibut fishing trials the time at which the dories left 

 and returned to the ship is given in the "Remarks" column. 



Temperatures are recorded in degrees Fahrenheit. The air and 

 surface temperatures, except where indicated by an asterisk, have 

 been taken from the ship's log. Their accuracy is not to be relied 

 upon to any great extent owing to the unfortunate placing of the 

 thermometer casing near the stack and the fact that the ship's ther- 



<> Loc. cit. in foot note on p. 3. 



