Mar. 1892.] THE BOTANICAL SOCIETY OF EDINBURGH. 273 



trees in the same belt, the Ehns have visibly surpassed them 

 all in rapidity of growth, and this is confirmed by their 

 large rate of 1-70 and 141. Their range, 1-50 to 1-80, and 

 1-15 to 1-75, was small. The rate of No. 60, an older but 

 quite young Elm, not 3 feet in girth, at the west end of the 

 grove on the high ground at the north-east corner of the 

 Arboretum, was only 0-32 for five years, probably from 

 poverty of soil. 



No. 23 in the rich hollow of the east shelter belt of the 

 Arboretum, No. 75 in the more exposed and sandy south 

 belt. This difference of position and soil may account for 

 the slow rate, 0'53, of No. 75, compared with O'Ql of No. 23. 

 The old Craigiehall Ash, No. 6*, 12 feet in girth, increased 

 0-70 in 1878, but after the disastrous winters of 1879-80-81, 

 its rate for thirteen years fell to 0-38, and this rate is still 

 maintained, although the tree shows many dead branches and 

 has a shabby look. 



(2) COXIFER-^. 



Abies Douglasii. 



Nos. 6 and 99 are in the Ahies collection. No. 66 on " the 

 Triangle," all in good, sheltered situations. 



No. 6 was quite healthy till moved a short distance in 

 spring 1889. Since then the annual shoots have been late 

 and short, and, although improving, the tree is far from 

 having recovered its pristine vigour. This history is 



