The Summer Birds of the Summer Islands. 55 



colony. On the 4th June we found most of the nests on 

 Glasleacbeg contained young, while, on the same day, I 

 did not see a single egg on Priest Island, although many 

 young birds were noticed. 



30. EissA TRIDACTYLA (Linn.). 



(Kittiwake.) 



Mr Bonar is quite certain that he saw a pair of these birds 

 diving in their characteristic manner in Baden Bay. I never 

 observed the bird anywhere during my stay in West Eoss- 

 shire, where it is undoubtedly very rare. 



31. Alca torda, Linn. 



(Eazorbill.) 



Found commonly in flocks and in company with Guillemots. 

 Mr Harvie-Brown saw a very few pairs in a crevice on the 

 east shore of Priest Island, where it no doubt nests. It 

 certainly does so on Bottle Island, for, on the 25th June, Mr 

 Bonar obtained two eggs, one hard-set, from a cliff on the south- 

 western shore, where he found a colony. As the loftier nests 

 were inaccessible, my companion could not form an accurate 

 opinion of the number of pairs which bred there. From the 

 number of birds which flew out on the approach of the boat, 

 it is probable that the colony numbered more than a dozen 

 pairs. I am inclined to think that the Eazorbill also nests 

 on Eilean Dubh. 



32. Uria troile (Linn.). 



(Common Guillemot.) 



Very abundant. When sailing to and from the Summer 

 Islands, we invariably saw very large flocks of these birds, 

 usually mixed with Eazorbills. We were unable to discover 

 the Guillemots nesting in any of the Summer Islands though 



