58 Dr David Christison on the [sess. li. 



reliable. The objectionable roughness in the bark is compen- 

 sated by the large increments, greater than in any other 

 deciduous species. 



Turkvih Oaks. — Girths, 47, 80 inches. Both fine healthy 

 specimens ; the first especially accurately measurable from the 

 smooth regidarity of its finely reticulated bark : its growth, 

 however, was slow, averaging not much above half an inch 

 yearly, while that of the older and rough-barked speci- 

 men at Craigiehall averaged nearly an inch. Eesults re- 

 liable. 



American Oak. — Girth, 35 inches. A somewhat damaged 

 young tree, growmg less than half an inch a year ; not very 

 reliable. 



English Oak. — Girth, 73 inches. The native oak, although 

 it attains a considerable size in the Edinburgh district, rarely 

 looks much at home in it, tending to defective ramification 

 and scanty foliage. The single specimen observed, growing 

 at Craigiehall, increased at the rate of only one-third of an 

 inch yearly, and the results cannot be regarded as character- 

 istic of healthy vigorous oaks in more suitable districts. 



Hornlcam. — Girth, 48 inches. Accurately measurable, but 

 growing at the rate of less than half an inch yearly. 



Birch. — Girth, 60 inches. Trunk rough and irregular. 

 Increases at the rate of less than half an inch a year. 

 Eesults not altogether reliable. 



Lime. — Girth, 46 inches. To all appearance a fine healthy 

 tree, but growing only at the rate of quarter an inch yearly. 



Spanish Chestnid. — Girth, 80 inches. Still vigorous, 

 increasing at the rate of nearly an inch in the year. Eesults 

 therefore probably reliable. 



Liriodendron. — Girth, 81 inches. Healthy; annual increase 

 about three quarters an inch. Bark rougli, Ijut the results 

 each year are so uniform that they may be accepted as 

 tolerably accurate. 



Hyeaniores. — Girths, 62, l.'iO indies. The older tree very 

 rough and scaly in th(i bark, and apparently ceasing to grow; 

 the younger, altliough to all a]>])earanco vigorous, increasing 

 at the rate of only one-third of an inch yearly. Eesults not 

 reliable. 



