532 



TRANSACTIONS AND PROCEEDINGS OF THE [Sess. lvii. 



III. Annual girth-increase of largest Ab. Doiujlasii, 

 Dolphinton. 



This table illustrates the extraordinary variation in 

 the rate of girth-increase from year to year of an Abies 

 Douglasii, from careful measurements taken by Mr. John 

 Orel Mackenzie of Dolphinton. A considerable annual 

 variation is characteristic of all trees, as I have shown at 

 length in a Paper oii the Increase of Girth in Trees (Trans. 

 Bot. Soc. Ed., 1888), but comes out more strikingly in a 

 tree of extraordinarily rapid growth, such as this, than. in 

 my ordinary examples. It is curious and worthy of 

 further investigation tliat this variation would not be 

 suspected from looking at sections of stems, as the width 

 of neighbouring rings seems in general tolerably uniforn). 



lY. Progressive rate of Abies Douglasii at Jardine 

 Hall, Dumfries. (Conifer Conference Statistics, 1801). 



Loudon gives tlie height as lo feet 2 inches in 1837. 



The to]) is much injured and broken by a colony of 

 rooks whicli liave met there for thirty years (W. H. 

 Maxwell of Munches). 



V. Additional instances of great size and rapid growth 

 (Conifer Conference Statistics, 1891). 



Abies nobilis, Golden Grove, Caermartlien. 



