REPORT ON THE MIGRATION OF BIRDS. 191 



Rlinvanl fort}' to fifty were seen, as related above. Swallows 

 appeared to migrate principally when the wind is southerly 

 (S.W. to S.E.), in light, variable, or fresh head- or side-winds, 

 and haz}' weather. Exceptions are found, however, at Dhuhear- 

 tach on July SOth, when the wind was N., fresh, and weather 

 clear; and at Skerryvore on Aug. 17th, when one appeared at 

 the lantern about 10 p.m. (two hours after lighting up) in a N.W. 

 light breeze, with showers. Swallows migrate mostly by day, 

 resting all night. My returns show that they passed at all hours, 

 but mostly before dark. 



Martin, Hirundo urhica. — Martins are noticed at two stations 

 only, viz., Butt of Lewis and Corsewall. The migration lasted 

 between July 29 th and Aug. 10th, or during eighteen days (but 

 data are defective). They travelled during the day, resting around 

 tiie hghthouses at night, with S. to S.E. and S.W. winds ; the 

 only one killed was when wind was N.N.E., at Corsewall. 



Wren. — The records are few of this species : usually noticed 

 on migration in large numbers ; they appeared at Monach Island 

 and Dhuheartach. The earliest date is Aug. 17th, when " some" 

 struck at 10 p.m., and between that and 3 a.m. ; wind W., and 

 haze. The latest date is Dec. 9th, when one was seen at 3 p.m., 

 with S.W. breeze, and showers. In fourteen years Mr. Edgar 

 never saw a Wren at the Butt of Lewis lighthouse. 



GoLDCREST, Eeguhis cristatus. — At Mull of Galloway on July 

 18th, alighting all night and resting. Mr. Edgar's letter of 20th 

 Sept. supplies the information that he has never seen Goldcrests 

 at the Butt of Lewis — a negative fact of value in tracing their exact 

 lines of flight. Perhaps in our next reports observers will state 

 in their remarks if any of the species noticed in this one have 

 hitherto been rare, or entirely absent from their stations in past 

 years. 



Robin. — Appeared at Kyleakin, and thence southwards at 

 Skerryvore, Rhuvaal, Skervuile, Rhinns of Islay, and Corsewall. 

 The largest number recorded at Corsewall, where fifteen struck 

 on Sept. 15th, at 11 p.m.; wind S.W., light breeze, and haze. 

 The earliest date is Sept. 10th — one at Skervuile, at midnight ; 

 wind S.W., light, and cloudy. The latest is at Rhuvaal, on Dec. 

 4th at 9 a.m., when one was seen; wind variable, light breeze, 

 clear. Thus, time occupied is between Sept. 10th and Dec. 4th. 

 A rush took place in September between lOtli and 21st, but no 



