2 TRANSACTIONS OF ROYAL SCOTTISH ARBORICULTURAL SOCIETY. 



sycamore, three trees well known in this country, and widely 

 distributed throughout Europe, 



First of all, taking up the spruce, let us see what the Swiss 

 results have to show. 



Table I. 



Swiss Experiments with Common Spruce Seed {Crop 1898) 

 sowed at Adlisberg (Zurich). 



Seed produced at — 



Winterthur, 

 Adlisberg, . 

 Pilatus, . . 

 Graubiinden, 

 Engadine, . 



Alti- 

 tude. 



Ft. 

 1800 



2200 



3300 



5100 



5950 



Seed I 

 Unsorted, I Seed Sorted, sown 1900. 



sown i8qq. I 



2- Year Old Seedlings. 



Ins. 

 5-3 

 4-0 



37 

 2'r 

 2*o 



•$. i; 



Large Seed 



In. 



4 "2 



4'i 



2-2 

 2'I 



^ V 



-Medium 

 Seed. 





Ins. 



3-8 



3*5 



19 



2*1 I II 



1*9 10 



Small Seed. 



Ins. 



3*4 



3 '3 

 17 

 1-8 



^ u 



Oz. 



26 



4-Year 



Old 

 Plants. 



Ins. 

 II-8 



9-2 



87 

 5-9 



57 



5-Year Old 

 Plants. 





Ins. 

 18 



14 

 14 

 10 



9 



Lbs. 

 15 

 10 

 10 



6 



S 



The general scheme of the experiments has consisted in 

 procuring seed from trees of approximately equal age situated 

 at different elevations. A careful study has been made of the 

 size and colour of the cones, of the shape and dimensions of the 

 trees and their foliage, and of the size and germinating capacity 

 of the seed. The seed has been sown in two nurseries, the one 

 (Adlisberg, near Zurich) at an altitude of some 2200 feet, and 

 the other (Stanserhorn) at an altitude of some 6200 feet. The 

 latter is situated at so high an elevation that any results obtained 

 there can have but a modified interest for us, so I propose to 

 confine our attention to the work at the lower elevation, which, 

 though much above the limits of successful tree-growth in this 

 country, presents conditions analogous to those found at a 

 height, say, of about 500 feet in Scotland. I do not, however. 



