EDITORIAL NOTES. 
Vll 
at which the influence of season is no longer felt on the open ocean. This 
depth was provisionally fixed at 100 fathoms, and it is of importance to note 
that at this and greater depths each observation of temperature and specific 
gravity may be treated as a good annual mean. 
The second part of the Report examines the temperatures and specific 
gravities at depths from 100 fathoms to the bottom, their relations to the tem- 
peratures, specific gravities, and currents near the surface, and the horizontal 
and vertical movements of the ocean in this way indicated. The results, so 
far as now ascertained, point unmistakably to the necessity for further ex- 
ploration of the Southern Ocean, the western half of the South Atlantic, and 
the Pacific from about long. 150'" W. to the American coasts, before cpm- 
pletely satisfactory explanations can be given for some of the phenomena 
pointed out in the Memoir. 
It will be seen, however, that Dr. Buchan has made a most important 
contribution to knowledge, which will be welcomed by all who take an 
interest in the science of the sea. 
The Report is illustrated by sixteen double-page maps. The manuscript 
was received by me in December 1891:. 
John Murray. 
Challenger Office, 45 Frederick Street, 
Edinburgh, January 12, 1895. 
