Mae. 1892.] THE BOTAJflCAL SOCIETY OF EDINBURGH. 



329 



C. atlantifia being separated from them only by a single 

 place. The three each of Ab. Douglasii, Cujjressus, Sequoia, Ah. 

 Lov'iana, and P. cxcclsa, are within fourteen, thirteen, twelve, 

 nine, and nine places respectively of each other. Taking a 

 wider \'iew, the seven trees of four species of Ahics are all 

 in the lower half of the list, and six of the seven trees of 

 four species of Finus are within tliirteen places in the 

 middle of the list. 



Equilibrium is established as high as the thirteenth and 

 fourteenth of fifty-eight trees in the Deciduous group, but 

 here it is so low as the twenty-fifth and twenty-sixth of 

 thirty-four. Hence twenty-four grew chiefly in the first 

 period and only eight chiefly in the second. Taking the 

 average of species instead of trees, and taking the old and 

 new trees separately, we get the results given in Table XIY. 



Table XIV. Proportional Increase in Girth in CoNiFERJi 

 IN THE First and Second Half of the Growing Season. 



Young Group. 



Species, 



Av. of 



Araucaria iiiib. . 

 Cupressus Laws. 

 P. austriaca 

 Retinosp. obtusa 

 Thuja gigautea . 

 P. Pinaster . . 

 P. excelsa , . 

 P. Murrayana . 

 Ab. Douglasii . 

 Ab. Hookeriaua 

 Ab. Lowiana 

 Ab. grandis 



Old Group. 



Species. 



Av. of 



1st i2nd 

 Half.: Half. 



25 

 27 



28-5 



29-5 



32 -.T 



37-5 



44-0 



45 '5 



46 



49 



53 



67 



Araucaria inib. 



Sequoia gigantea 

 P. austriaca . . 

 Cupiessus Laws. 

 Ab. Lowiana . . 

 Cedrus atlantica . 

 Ta.xus baccata 

 Cedrus Deodara . 



3 trees 



4 „ 



1 M 



1 ,. 



1 „ 



1 „ 



4 „ 



4 „ 



64 

 63 

 56 

 48 

 45 

 34 



34 

 36 

 37 

 44 

 52 

 55 

 56 



In the group of young trees, six of the twelve species grew 

 to a marked extent chiefly in the first period, three did so 

 to a less well-marked extent, in one the periods were about 

 equal, and in two the excess fell in the second period. The 

 extremes are Araucaria, with 75 p.c. in the first period, and 

 Ah. grandis, with 67 p.c. in the last period. 



The older group contains some trees and one species which 

 are not included in Table XII. ; of the eight species four are 

 not represented in the younger group. In five of the eight the 

 superiority of the first period is well marked ; in one there 



TRANS. EOT. SOC. EDIN. VOL. ilX. 2 C 



