METEOROLOGY. 



XXVll. 



seasonal variation of the rivers and estuary is perhaps best shown by 

 the following table : 



The width of the estuary being about two miles at Little Ross, it is 

 probable that these means may be considered applicable to the Solway 

 Firth rather than the estuary. 



At Little Ross the water temperature was higher than that of the air 

 in seven months out of twelve, and the difference ranged to from 2-2 to 

 2 -9. The mean monthly temperature of the rivers, on the other hand, 

 was never higher than that of the air, though there were occasional days 

 in which the water was warmer. 



The difference between the Nith and Dee observations are probably 

 due to two circumstances. First, those of the Nith were taken in the 

 year 1889, an< 3 those of the Dee in 1890; and secondly, the hour of 

 observation was as a rule later, and nearer the maximum heat of the 

 day on the Dee than in the case of the Nith. The observations of the 

 temperature of the Dee were taken at Langland by the Rev. W. T. Gordon, 

 minister of the parish ; and those of the estuary or Solway at the island 

 of Little Ross, by Wm. Macdonald, the lighthouse keeper there, and 

 in both cases with great regularity. 



THE GEOLOGY OF DUMFRIESSHIRE. 

 BY B. N. PEACH, F.R.S., F.G.S., AND T. IIORNE, F.R.S.E., F.G.S. 



With the exception of certain limited areas in Nithsdale, Annandale, 

 and along the fertile region bordering the Solway, the County of Dum- 

 fries is composed of Silurian strata, forming part of the ancient Silurian 



