70 



APPENDIX TO KEPOBT ON OYSTER CULTURE 



Table II. 



Table of Mean Temperatures of the Sea and Air at Noon on the 

 West Coast of France. 



(1.) In Centigrade degrees. 





May. 



June. 



July. 





,, c Near 

 AtSea - Shore. 



M, 



At Sea. 



Near 

 Shore. 



Air. 



At Sea. 



Near 

 Shore. 



Air. 



St. Marc (Bay of Granville), 

 Gorvather (Bay of Trinity), 

 Arcachon, .... 

 Locqueltas (Auray River), . 

 On board the Congre, . 



o 

 16-0 



o 

 13-6 



17-0 

 16-1 



O 



16-4 



23-9 

 18-3 



o 



172 



17-0 

 17-0 







15-2 

 19-0 

 19'3 

 175 

 19.0 



o 

 18-2 

 22-3 

 24-6 

 222 



o 



18-8 



20-5 

 20-5 



17-4 

 20-3 

 21-8 

 21-3 

 22-2 



23-8 

 25-0 

 290 

 265 



The above Table, in Fahrenheit degrees, and including Jersey. 



St. Marc, 



Gorvather, . 



Arcachon. 



Locqueltas, . 



On board the Congre, 



Jersey, . 



56-4 



62-6 

 61-0 



75-0 

 64-9 



63-0 



62-6 

 62-6 



58-3 



59-0 

 66-2 

 66-7 

 63-5 



66-2 



64-7 

 701 

 78-3 

 72-0 



65-8 



68-9 

 68-9 



63-4 

 6S-5 

 71-2 

 70-3 

 72-0 



74-8 

 77-0 

 84 2 

 79-7 



73-8 



It is immediately manifest that the highest sea temperatures were ob- 

 served at the stations in the French group, and the lowest in the northern 

 and eastern group of Great Britain. The sea temperature on the coast 

 of Ireland seems upon the whole to have been a little above that on the 

 coasts of England and Scotland. These results assist, moreover, in 

 pointing out the cause of the comparative superiority of the Irish coast 

 sea temperature. The temperature of the surface of the ocean at any 

 point is due principally to the sum of all it gains from sunshine and 

 warm currents, minus the sum of all its losses from radiation, evapora- 

 tion, and cold currents. If the heat brought by warm currents should 

 be considerable it may cause the mean temperature of the water to sur- 

 pass that of the air above it, and at those times of the clay when the air 

 temperature is in excess of the sea temperature the difference between 

 them is reduced in value. At noon in summer the air is usually warmer 

 than the sea ; we may conclude, therefore, that whichever group of 

 stations shows the smallest difference between air and water tempera- 

 ture at noon is the group in which the influence of heat-bearing currents 

 is most decided. The following table is constructed to show the applica- 

 tion of this principle to the results under discussion : — 



Table of Differences between Air and Sea Temperatures. 

 South and West Coasts of Ireland. 



May. 



June. 



July. 



Tramore, 

 Crosshaven, - 

 Kenmare, 

 Ballyheigue, 

 Ballyvaughan, 

 Pigeon Point, 

 Innisgowla, - 

 Innislyre, 

 Belmullet, - 

 Pullendiva, - 



+ 5-3 



+ 10-0 



+ 6-0 



-0-2 



1-1 



- 



+3-0 



4-0 



4-3 



-3-0 



-3-0 



-1-0 



+ 3-0 



+ 6-6 



+ 8-0 



10 



13 



2-5 



4-3 



5-8 



6-0 



2-5 



6-0 



110 



_ 



_ 



7-0 



-04 



4-3 



7-8 



Means, 



1-7 



4-0 



5-7 



