of the Fishery Board for Scotland. 



427 



Table — Comparing Mean Monthly Temperatures of Surface Water 

 at 9 a.m. at Stornoway and at the Undernoted Stations. 



Date. 







Stranraer. 



Oxcar. 



Bell Rock. 



Inver- 

 gordon. 



1890. 

 April, 

 May, 

 June, 



-0-8 

 -1-0 

 -0*6 



-07 

 -0*3 

 -0-9 





+ 0-1 

 + 0-3 

 -0-3 



+ 0-9 

 + 1-5 

 + 07 





1891. 

 May, 

 June, 

 July, 



+ 0-3 

 -1-0 

 -1-4 



+ 0-8 



-0-8 



-0-9 

 -2-4 

 -3-9 



+ 0-8 

 -0*3 

 -2-6 



+ 1-4 



+ 2'0 



+o-i 





1892. 

 May, 

 June, 

 July, . 



-1-4 

 -T4 

 -2-0 



-o-i 



-1-3 

 -2-3 



-2-2 

 -3-5 

 -4-4 



-o-i 



-0-8 

 -1-4 



+ 1-4 



+ 07 

 -0-6 



-2*4 



+ means that the temperature at Stornoway was higher than that of other Stations. 

 - that it was lower. 



The difference of temperature in 1892 was very remarkable. For the 

 three months, May to July, Stornoway averaged 1 0, 5 colder than Ardrish- 

 aig or Brodick, and 3° - 5 colder than Loch Ryan at Stranraer. 



Kirkwall Bay. — This bay on the north coast of the mainland of Orkney 

 should serve as a connecting link between the thermal conditions of the 

 Atlantic and the North Sea. The anchorage was, unfortunately, not deep 

 enough to give quite satisfactory results, being only between 6 and 7 

 fathoms. The temperature was always the same from surface to bottom. 



The mean monthly temperature of the surface water at Kirkwall dur- 

 ing September in 1889 was 10° *3. Comparing with the West Coast 

 Stations, that of Campbeltown was 11°*5, Rothesay 1 1 ° *7; and with East 

 Coast Stations, Abertay was 12° "8, Invergordon 1 2° 9. For the same 

 month in 1891, the Kirkwall mean was 12°"3, the same as Rothesay and 

 Ardrishaig, while Brodick was 12 0, 6, and West Loch Tarbert 14T°, In- 

 vergordon was 12° -2, Abertay and Bell Rock 12° -5, and Oxcar 12° '9. 



In the month of October, the mean for 1890 at Kirkwall' was ll°-2, 

 that of Ardrishaig H°'0, Brodick 11° -4, Rothesay 12°-0, Campbeltown 

 12°-2, Oban 8°-2, Invergordon 9°7, Abertay 11°T, Bell Rock ll°-f>. 



Thus, in September, the water at Kirkwall is usually colder than at the 

 other Stations, but by October some of the East Coast Stations begin to 

 show a lower mean, which is more marked as the winter advances. 



Considering winter monthly means, these can be calculated for Kirkwall 

 in November and January 1891, and February 1890. In November 1891 

 the mean surface temperature at Kirkwall was 8 o- 0, and all Stations except 

 Bell Rock (7°-7), West L,>ch Tarbet (7°'6), and Stranraer (7°-0) were 

 higher; Rothesay as much as 2°*1. 



In January (1891) all West Coast Stations were warmer than Kirkwall 

 (5°*4), except Ardrishaig (5°*1) ; and the East Coast Stations were lower, 

 except North Carr, which was the same, the Bell Rock being also nearly 

 the same (o°*3). 



In February, considering 1890 records, Kirkwall 5° 7, was still colder 

 than West Coast Stations (Rothesay 8 o, 0), except Ardrishaig (5 0, 6), the 

 same as the Bell Rock, and warmer than other East Coast Stations, — 

 Invergordon 4°'5, Oxcar 5 o, 0, Abertay 5° -2, North Carr 5°*6. 



The September maximum and the February minim um are thus, as 

 might be expected, less extreme at Kirkwall than on the East Coast. 



