76 Report of Meetings for 1890. By i)r J. Hardy. 



to near the public road. There are several planted out garden 

 flowers in the plantations. Geranium pratense and Glechoma 

 Jiederacea were noted on the outskirts ; and Ivy is employed as a 

 cover in the plantations. 



In front of the house, early in the morning, the House Swal- 

 lows (without any Martins) were hawking after flies in lively com- 

 motion ; and the Grey and Pied Wagtails were engaged in the 

 same pursuit here and afterwards at Wark among the grass. 

 Very large numbers of Lapwings were feeding on the grassy 

 haughs round Carham. The Warblers were no longer repre- 

 sented in the gardens ; but the Cushat's cooing was still heard 

 in the morning. 



Examples of the Carham chert were examined at the Hall. 

 They have a whitish siliceous character, with reddish or grey 

 jaspery markings in layers, not unlike what I had picked up 

 after the Hawick meeting in the fields behind Saughtree, and 

 have probably been formed by igneous action on quartzy and 

 marly shales. They have been already adverted to in Professor 

 Nicol's remarks on the Robert's Linn jasper rock, see 

 p. 69. 



Some of our members were not aware of the existence of lime- 

 stone beds in the Tuedian rocks here, strongly impregnated with 

 magnesia, in consequence of their intermixture here with por- 

 phyrites. This has been known from the earliest period of 

 modern geological research. Winch calls them "dolomites." 

 At Brigham Haugh, writes Dr E,. D. Thomson (Statist. Acct. of 

 Berwickshire, p. 52) "the bed of the Tweed consists of Mag- 

 nesian Limestone, containing red hornstone and crystals of 

 calcareous spar. The south bank is formed of alternations of 

 this rock and ciaystone porphyry, and these extend for some 

 miles up the river. The analysis of tolerably pure specimens 

 from Haddeu Eig gives nearly — Carbonate of Lime, 6-25 ; Car- 

 bonate of Magnesia, 5-25=ir5, or an atom of each." Owing to 

 the quantity of magnesia in the Carham limestone, the farmers 

 gave up using it, and resorted to Sunnilaws and Hadden, where 

 the proportion of this ingredient was less. Mr Bolam has fur- 

 nished me with a copy of an analysis of limestone from Hadden 

 quarry, which can be compared with the purer limestone of 

 Scremerston thereto annexed. 



