340 TRANSACTIONS, NATURAL HISTORY SOCIETY OF GLASGOW. 



Area. 



1863 (or 1864), .. 3,330 feet. 



1899, taking average diameter as 85 ft. =5,674 ft., fully £th of an acre. 



" A growth in girth of '73 of an inch yearly is very great 

 for a Yew, and is likely to be partly accounted for by the 

 swelling under the division of the trunk on the one hand, and 

 on the other by the enlargement at the roots. But the tree 

 appears to be very healthy and vigorous, and in 1896 we were 

 told that it always produced large quantities of pollen. 



" A Horse Chestnut near the house was measured — girth, 

 13 feet 1 inch at 3 feet 6 inches from the ground — an increase 

 of 6 J inches in six years and 13 inches in twelve years = an 

 average of 1'08 inch per annum. In 1899 it had a spread of 

 90 feet. 



"Mr. John Paterson reports that the Swallow, the Sand- 

 martin, and the House-martin were seen on the side of the 

 Gryfe at Crosslee, and the Willow-wren was common." 



Murroch and Auchenreoch Glens, 26th April, 1902. — This 

 excursion, which was under the leadership of Mr. Wm. Armour, 

 C.E., was a joint one along with the Geological Society, and 

 the interest was mainly geological. Mr. John Renwick has 

 contributed the following report: — 



" Proceeding by rail to Dumbarton, the party walked by the 

 highway to the lower end of Murroch Glen, ascended this valley 

 into Auchenreoch Glen, and returned to Dumbarton across the 

 moor and down the hill road. 



" The rocks through which the two streams flow belong to 

 the lowest division of the Carboniferous system — namely, the 

 Calciferous Sand-stone series, or Cement-stone group. They are 

 known as the ' Ballagan beds/ from being typically exposed in 

 Ballagan Glen, near Strathblane, and consist of clays, marls, 

 shales, sand-stones, and cememvstones. They appear to have 

 been laid down in extensive lagoons, or shallow water basins. 



