FOG SCALE 423 



No. 



FOG. 



Description. 



No fog or mist, horizon clear. 



Light fog or mist, horizon invisible ; objects visible 



at working distances. 

 j Moderate fog ; lights, passing vessels, and landmarks 

 I generally indistinct under a mile. Fog signals 

 [ sounded. 



/Thick fog ; ships' lights and vessels invisible at 

 \ quarter-mile or less. 



MARINE STATIONS 



It is hoped that this section may prove useful to travellers 

 in need of local information. Even those State or Official 

 stations marked t, which are not open to researchers from 

 outside, may be relied upon in most cases for advice and 

 assistance. 



This list has been revised by means of Professor C. A. 

 Kofoid's " Biological Stations of Europe " (U.S. Bureau of 

 Education), Washington, 1910, which contains full descrip- 

 tions and photographs of the stations, boats, etc. Assistant 

 Directors are marked A.D. 



