92 REPORT ON THE MIGRATION OF BIRDS. 



This class of stations are situated as follows : — 

 Whalsea Skerries... 148 feet... white, revolving every minute. 



N. Ronaldshay 180 feet. ..white, revolving every ten seconds. 



Cromarty 60 feet... red, fixed (in the town). 



Revolving lights, whatever the height, yield fewer returns 

 th&n fixed, hut are better than flash or red sectors. 



We also thank those who, situated at still less likely stations, 

 have nevertheless taken an interest in our work. 



Bressay sends one year's return (1882) ; 105 feet ; red and 

 white, revolving every minute. 



Xoss Head. — One year (1883), A. Greig; 175 feet ; white and 

 red revolving, every half minute. 



Kinnaird Head. — One year (1884) ; a blank schedule, valuable 

 on negative grounds ; 120 feet ; white and red sectors, fixed. 



Girdleness. — Two years (1880 and 1884) ; 185 feet ; white 

 fixed. Thomas Gallie and J. McAlister. The situation is said 

 to be unfavourable, apart from light or altitude. 



Finally, taking the remaining lights which have returned no 

 years schedules, we will analyse their positions, &c. 



Start Point. — 80 feet ; red, fixed. Class V. 



Hoy Sound. — (55 and 115). Low, white, fixed, facing N. 

 High ditto ; red and white sectors, fixed. V. 



Cantick Head.— 115 feet ; white, revolving every minute. 



Holborn Head. — 75 feet ; white and red flash, 10 seconds, 

 facing N. V. 



Tarbat Xess. — 175 feet ; white intermittent, 2£ minutes. It is 

 not quite clear to me yet why this station should not yield 

 returns (see map), unless it be considered partially land-locked 

 from E. and S.E. 



Buchan Xess. — 130 feet ; white flash, every 5 seconds ; and 

 close to fishing village. 



Montroseness. — 124 feet; white, fixed ; but amongst houses. V. 



"We think the above analysis places almost beyond doubt 

 that the best position for a lights to attract birds is in a light 

 ship (witness the E. English Coast returns) ; next, an island of 

 low elevation ; next, an island of considerable elevation, if facing 

 east, not if facing north ; and that the worst are those at high 

 elevations, and especially if facing otherwise than E., on the 

 East Coast, or on East Coast Islands, or those in midst of 

 towns, or in land-locked situations ; that the best description 



