'12 I'RKHrDKNT'H AliDllFCBH. 



Corroot obscrvationn have been cstablisliod at Bywoll, in 



addition to tboso at AlloiilKsads. The difforenco of elevation 



above th(! sca-lcvel of these two places is l.'Jll feet; the former 



bcinc: 50 feet, the latter l.'5G0 feet above moan sea-level. As 



. . . * 



these places are witliin a horizontal range of less than twenty 



miles, it is curious to observe the comparative states of the weather 



in tlio slieltered vale; of Tyne, and the mountainous moors of 



Allmlieads ; and in order to present a clear view of this, I have 



had a diagram engraved to accompany this address. The range 



of barometer and thermometer, together with the rain-fall at both 



places, is shown in the depth of last winter, viz., in the months 



of December, 1804, and January, 1855. The vmiformity of the 



barometric curves is remarkable; and it will be observed how 



nearly the inlnimum temperature of liywell corresponds to the 



maximum of Allcnheads. A ])lack shade indicates the quantity 



of rain or snow which fell daily at l>ywell, and a lighter shade 



represents the like conditions at AUenheads, T am not aware 



that any accurate comparison has hitherto been published of 



Meteorological phenomena, at so great a vertical range ; and this, 



I trust, may bo a sullicient apology i'or requesting the Members 



of til is Society to accept this addition to the observations which 



1 have now the honour to bring before them. It was my wish 



also to engrave the smaller map placed on the table, showing 



Sea, Middle, and Mountain zones of elevation ; but the data for 



determining exact heights are so incomplete, that nothing but a 



mere approximation could be attempted. This, for any practical 



purpose, would bci so defective, that I recommend the construction 



of a map, to be deferred until further progress of the Ordnance 



Ueological Survey. 



In the progress of that great national work — the accurate 



horizontal i^urvey and vertical admeasurement of Great Britain, 



under the direction of the Board of Ordnance — many of the 



Members of this Society are much interested, and it is indeed, 



generally, a matter of public concern. It is with regret, there- 



{o\\\ tl\ai 1 l(\irn from higli authority, that a delay of three years 



is likely to take place before th(> survey of Northumberland is 



placed in full activity. I was lately honoured by a communica- 



