APPEARANCE AT THE SURFACE "9 



The data fall short of what is required in many ways. In addition to the difficulties mentioned 



earlier in the paper, the stop-watch was out of action for some weeks, and the following circumstances 



have also to be considered before the data are subjected to scrutiny. Serial observations were seldom 



10' 



15' 



?0' 



2 

 3 

 4 

 5 

 6^ 



DBS. 69-77 



2- 

 3 

 4 

 5 

 6 

 7-1 



0B5. 107-123 



_puju_u 



en 



0B5. 189-200 



-1 1 1 1 



20' 



5' 10' 15 



Fig. 2. Sequence of blowing and sounding intervals in minutes. The intervals are proportional to 

 the minimum length of breath. 



possible for periods longer than 20 min. A whale that might be sighted by the ship at a distance of 

 4-5 miles would be reached in 25-35 min., but might be disturbed considerably earlier. Evidence of 

 such disturbance will shortly be examined. After this, observations were interrupted by markmg 

 work. Thus the observations were made as and when the marking programme permitted. 



The tendency of Fin whales to swim in pairs or in schools, means that few, if any, of those appearing 

 at a distance to be alone, are without doubt known to be unaccompanied: indeed, the data listed in 



