The subject of heights of lanterns and their colours as attractions for birds has not developed as yet any fresh facts, but, with the conviction that they will yet do so, I still retain the table of heights given. Actual experiment, however, would very likely very soon set this part of the subject at rest (vide General Remarks, East Coast of Scotland Report, 1880, pp. 19, 20). A light-vessel or two placed in an equally favourable position with, let us say, the Isle of May or the Bell Rock on the east coast, or at some point north of Tweed, would, I believe, soon show us whether the preponderance of records south of the Tweed is entirely due to old-established lines of migration, or to the number of light-vessels on the English coast, or partly to both. It would, I think, assist in proving or disproving theories of land-communications which have been advanced and disputed by previous writers. At present we cannot positively state from our present data whether an actual or only an apparent preponderance of birds pass south of the Tweed in autumn. It appears a little curious to find, however, a highway of migration by the Pentland Firth so much further north than the stations mentioned. Writing from North Ronaldshay Mr. Tulloch remarks upon the usual scarcity of birds there, and says "they keep more direct for the mainland"; and he remarks also upon the abundance of birds seen in September and November at Pentland Skerries, where he was lighthouse-keeper for four years. He remarks on the abundance of Mountain Thrushes, Blackbirds, Owls, Woodcocks, Wrens, Robins, and Titmice which occur there when the wind is from the east, and from which station I have a large numerical return this year. This at first sight appears to be a contradiction of what I have said about the bulk of the birds passing south of Bell Rock, but, be it noted, the prevailing winds at Pentland Skerries from August 23rd to September 12th were from points between north and south by east, but never by west, and thereafter, between September 14th and October 10th, they were prevailing south to south-west, but never west or north-west. From October 14th they backed to north-east, and easterly winds again prevailed here on till late in November. The isolated position of the lights at Pentland Skerries, combined with the local prevalence of easterly winds, is perhaps sufficient to account for the large mass of the records. At all events I think the Pentland Skerries returns are deserving, both now and in future, of special attention and study, and I look upon it as a particularly interesting station.