48 



SIR ROBERT CHRISTISON AND DR CHRISTISON ON THE 



Table II. — Annual Increase in Girth of Evergreen Trees, 

 All in the Botanic Garden or Arboretum, except those marked " Craigiehall." 













Increase. 







Trees. 



Date and Girth 















when first measured. 



















1878. 



1879. 



1880. 



1881. 



1882. 







Inches. 



Inches. 



Inches. 



Inches. 



Inches. 



Inches. 



Douglas pine, 



1878 



5610 



0-60 



045 



0-45 



0-60 



0-50 



>> >> 



» 



64-30 



0-80 



0-30 



0-35 



0-35 



0-40 



Pinus excelsa, 



t) 



30-90 



0-35 



0-20 



0-05 



0-30 



0-15 



» j> 



» 



32-70 



0-40 



0-20 



0-35 



0-35 



0-40 



Sequoia gigantea, . 



>> 



23-95 



1-15 



0-80 



1-00 



0-35 



0-70 



» » 



>> 



23-95 



1-75 



1-65 



1-80 



1-50 



1-40 



it j) 



■ J) 



18-95 



1-85 



1-50 



1-50 



1-30 



1-75 



» » 



M 



23-85 



1-25 



1-70 



1-55 



1-35 



1-65 



De9dar, 



a 



2610 



1-10 



0-70 



0-45 



0-35 



0-95 



» • 



>} 



64-00 



1-20 



0-60 



0-40 



0-25 



0-70 



Ticea Lowei, 



}> 



1500 



1-40 



1-25 



1-40 



0-90 



1-05 



Araucaria, . 



;, 



18-10 



0-60 



0-50 



0-55 



0-50 



0-45 



>» ■ ■ 



>} 



20-20 



0-50 



0-90 



0-75 



0-60 



0-85 



„ (Craigiehall), 



1879 



1790 





0-85 



0-65 



0-45 



0-70 



Atlas cedar, . 



1878 



27-55 



.1-65 



140 



1-75 



1-40 



1-60 



Evergreen oak, 



1879 



29-05 





0-40 



o-io 



o-io 



0-25 



Yew, . 



1878 



67-60 



6-60 



0-60 



0-35 



0-50 



0-50 



„ 



>? 



34-10 



0-50 



0-15 



0-20 



0-30 



0-45 



>/ » 



1879 



37-50 





0-60 



0-40 



0-40 



0-55 



,, • > 



» 



2350 





0-30 



0-35 



0-45 



0-55 



,, • • • 



• >> 



33-30 





0-45 



0-40 



0-35 



0-45 



„ f • ■ 



1880 



32-35 







0-15 



015 



0-40 



Cypress (Craigiehall), 

 Total increase of 1C 



1879 



14-20 





0-80 



1-15 



0-85 



0-85 

















trees first measurec 



, 















in 1878, . 







15-70 



12-90 



12-90 



10-90 



13-50 



Average per tree 



. . . 





0-98 



0-80 



0-80 



0-68 



0-84 



The same, with 7 addec 

















in 1880, . 











16-10 



13-65 



17-23 



Average per tree 



. . * 









0-70 



0-59 



0-75 





The most remarkable result from the whole series of observations is the 

 want of correspondence between the deciduous and evergreen classes in the 

 increase and decrease of the growth of wood in the different years under review. 

 Thus, as the tables show, a remarkable decline took place in both classes in 

 1879 as compared with 1878, the average growth of each tree for these years 

 in the deciduous class being 0*68 in. and 0'50 in., and in the evergreen class 

 0-98 in. and 0*80 in. But in 1880, while the deciduous average declined still 

 further, — to 040, the evergreens remained quite stationary ; * and in 1881, when 



* Sir lloiiF.m Christison believed that they also had declined, although to a less extent, but he was 

 misled by an error in the figures of his MS. 



