72 ANNALS OF SCOTTISH NATURAL HISTORY 



various waters from one season to another form a most 

 interesting problem in connection with the study of the 

 North Sea a problem which Professor Pettersson believes to 

 have a most important bearing on the migration of the 

 herring." 



I am now able to add that the Olna station got 79 

 B.borealis 49 bulls averaging 40.5 feet, 30 cows averaging 

 38.9 feet. The largest bulls were 54, 50, and 50 feet long ; 

 The largest cows were 5 i and 47 feet long. 



There were two B. sibbaldii, 5 8 and 60 feet, both bulls ; 

 four Megaptera one cow, 47 feet; three bulls, 58, 55, and 

 5 2 feet long, an average of 5 5 feet. 



The Sperm Whales were, as usual, all bulls 58, 63, 54, 

 59, 58, and 55 feet, an average of 57.8 feet. 



Among the B. musculus killed the longest bulls were 7 i , 

 71, 71, 71, 72, and 73 feet ; the longest cows were 71, 71, 

 71, 72, 72, 73, and 73 feet. 



LOCHEND, OLLABERRY, SHETLAND. 



THE BIRDS OF FAIR ISLE. III. REPORT ON 

 OBSERVATIONS MADE DURING THE 

 YEAR 1907. 



By WM. EAGLE CLARKE, F.R.S.E., F.L.S. 



OBSERVATIONS on the movements of birds were systemati- 

 cally carried on at Fair Isle throughout 1907 ; and, like 

 those for the preceding year, have yielded results of con- 

 siderable interest. 



It is not, however, my intention to deal with the main 

 mass of the observations at present ; they are reserved as 

 a contribution towards a future report on the remarkable 

 passage movements witnessed at this station, which I hope 

 to prepare when further investigations have been carried out. 



The object of this contribution is to afford such additional 

 information on certain birds, already recorded for the island, 

 as may be interesting and necessary ; and to enumerate, 



