78 REPORT ON THE MIGRATION OF BIRDS. 



past." [This is an interesting note as pointing directly to a 

 periodical migration of the Petrels. Of course how much such 

 may have been simply caused by increase or diminution of food 

 supply is at present difficult to determine. — J. A. H.-B.] 



In October only two records, but both on 5th and 6th at 

 11 P.M. and 2 a.m., struck, but were not killed. [They are 

 evidently thus included in the impulse and great migration of 

 this date. It is noteworthy that we have all through our past 

 reports seldom received definitive record of actual migration of 

 the Petrel till now.— J. A. H.-B.] 



Colymbim. — Divers, Northern Divers, Grebes, etc. — In 

 February, one G. N". Diver on 7th at Skervuile. 



In March, one do. on 24th at same place. In April, no 

 records. In May, two at Lochindaul on 7th, and on 10th at 

 Kyleakin. No more records of G. N. Divers till 23d October, 

 when one was seen at Bona, Skye, "swimming round the island." 

 Then, 16th November, at Skervuile, and December 26th at same 

 place. 



By collecting careful notes on the appearance, residence on 

 our coasts, and departure from different stations, much might 

 be learned of the reason why some northern species remain to 

 breed some seasons more than others, or remain longer resident 

 into the summer months. 



Alcid^e. — Puffins, Guillemots, " Tysties," " Bock Birds," etc., 

 Razorbills. — In April, a flock of 100 Puffins fishing around 

 Bhinns of Is! ay on 3d, and twelve Tysties or Black Guillemots 

 on 10th, " floating in the sound." In May, Tysties at Lochin- 

 daul on the 20th, and Puffins — twenty — flying west on 2d, at 

 Kyleakin. In June, great numbers all day of Bazorbills fishing 

 around Lochindaul. In August a few all day on 28th at same 

 place. In September, one young Tystie on 15th at Dhuheartach, 

 " eating fish on the rocks." In October on 19th and 21st con- 

 tinuous flocks, 6 to 10 a.m., N., light, clear, flying south. This 

 " rush " of sea birds is almost as sudden and remarkable as that 

 of our land birds this year. A few still found in December at 

 Skervuile. No notices South of Clyde. 



