1916.] Townsend, Voyage of the 'Albatross' in 1911. 453 



Appendix A. 



Dredging and Hydro-graphic Records of the U. S. Fisheries Steam- 

 ship 'Albatross' during the Voyage to the Gulf of California 



in 1911. 



Explanation of Tables. 



The last previous dredging station of the 'Albatross' was No. 5G72, and 

 the last hydrographie station was No. 4937, occupied during the Philippine 

 Expedition, 1907-1910. (See Bureau of Fisheries Document No. 741.) 

 Twenty-seven dredging and sixteen hydrographie stations were occupied 

 during the Lower California Expedition, extending the series of dredging 

 stations to No. 5699, and the hydrographie series to No. 4953. In the tables 

 the series are distinguished by the prefixed letters D and H, respectively. 



Only those stations where the ship's gear was used (i. e., with the ship 

 as an instrument) to collect natural history specimens have been designated 

 in the records as dredging stations. No numbers have been given to the 

 shore stations, nor to minor collections made with the ship at anchor. 

 Numbers should be given in the dredging series to hauls of the large inter- 

 mediate net when used in a tideway with the ship at anchor, but this net 

 was not used during this cruise. 



Since the shore work constitutes such an important part of the total, the 

 data regarding shore stations is shown in chronological order with the 

 dredging stations, the locality, apparatus, etc., appearing in the appropriate 

 columns. To economize time most of the reef collections of fishes were made 

 with dynamite. The method was to locate the desirable fishes in the coral 

 growth or among the rocks by means of a view glass ( a glass-bottomed box) 

 used from a boat. A small charge of dynamite with electrical connections 

 was carefully lowered and discharged. Such fishes as floated were at once 

 collected with a dip net, and the place marked by a buoy. As soon as the 

 bottom had cleared it was searched and the dead fish gathered by means of 

 long-handled spears. Seining operations were carried on wherever suitable 

 beaches could be found within reasonable distances from where the ship was 

 anchored. A general location of the beaches is shown in the column headed 

 "Remarks." The dynamiting operations were usually about the reefs and 

 rocks in close proximity to where the ship was anchored, and it is impractica- 

 ble to give the locations more definitely. 



