REPORT ON SCOTTISH ORNITHOLOGY IN I915 167 



the number of summer visitors recorded increased as the 

 month advanced, and as there are few notes from the 

 Northern Isles during this period, it is probable that these 

 were arrivals of our own breeding birds. There are also 

 a good many records of winter visitors and passage migrants. 



May. 



May was a calm month, cold up to the 20th, after 

 which it became somewhat warmer. Variable light airs 

 characterised the first week, and a great rush of summer 

 visitors poured into the ^country ; a certain amount of 

 passage migration is also recorded, and an unusual number 

 of winter visitors were still with us. Up to the 20th the 

 weather was cold, and the wind almost entirely from some 

 northerly quarter ; from the 20th to the 24th the winds 

 were south and south-east, after this they were chiefly 

 north and light to the end of the month. The arrivals 

 continued, becoming less as the month advanced, until by 

 the end it was apparent that our summer visitors had 

 reached their nesting places. Less passage migration than 

 usual was recorded, this assuming the character of a steady 

 trickle, there being no sign of the rush which often comes 

 at this season. An unusual number of winter visitors are 

 recorded as remaining with us throughout the month, 

 these naturally becoming fewer towards the end of the 

 period. 



June. 



Up to the 1 2th of June the winds were chiefly westerly 

 and southerly, and light ; after this till the end of the month 

 they were from north-east to north-west, and light or 

 moderate in force. A little passage migration is recorded 

 in the first week, and arrivals of Terns at their northern 

 breeding places are also reported. In the second week 

 there was a little passage of Hirundinae and Swifts, and 

 a late Fieldfare is noted. To the end of the month there 

 was little migration ; birds began to flock after nesting, and 

 niovements of small numbers of Wader wer.e noted. Large 



