Nov. 1892.] BOTANICAL SOCIETY OF EDINBURGH. 



455 



Professor Bayley Balfoue exhibited specimens iu spirit, 

 from the Museum of the Eoyal Botanic Garden, of Cahomha 

 aquatica, showing its heterophylly, and of the pitcher of 

 Nepenthes h ica lea rata . 



The BuESiDENT (Dr. David Christison) delivered the 

 opening address, taking for his subject " The Actual Size 

 of the Largest Trees of Species Native or Long Naturalized 

 in Britain, particularly in Scotland, with a Discussion of 

 the Question of their Probable Age." The address is 

 elaborated in the following paper : — 



The Size, Age, and Eate of Girth-Inckease attained 

 BY Trees of the Chief Species in Britain, particularly 

 IN Scotland. By Dr. D. Christison, President. 



Contexts of the Taper. 



PAGE 



457 



Nou-Coniferous Evergreens — 

 I. Holly, . . .506 



Introductory, . 



A. Deciduous Trees — 



I. Oak, . . . .461 

 II. Beech, .... 472 



III. Chestnut, . . .482 



IV. Ash, .... 487 

 V, Sycamore and Engli'ih 



Maple, . . ^ .491 



VI. Lime, .... 494 



VII. Elm, . . . .495 



VIII. Horse Chestnut, . . 497 



IX. Walnut, . . .499 



X. Poplar, .... 500 



XI. Oriental Plane, . . 501 



XII. Birch, .... 502 



XIII. Willow,. . . .503 



XIV. Alder, . . . ,503 

 XV. Eucalyptus, . . , 504 



XVI. Other Deciduou.s Species, 505 



The Presidential address on which this paper is founded 

 was designed to show the actual size of the largest trees 

 of species, native or long naturalized, in Britain, particularly 

 in Scotland, and to discuss the question of their probable 

 age. The extended form in which it is now presented gives 

 greater completeness to the subject by the addition of 

 information as to the size that species of more recent 

 introduction have attained, and by a consideration of the 



