Mar. 1892.] THE BOTANICAL SOCIETY OF EDINBURGH. 271 



The annual rates of ISTos. 71 and 74 were neaiiy alike, 

 1'09 and ri2, and they followed each other steadily in the 

 rise and fall of the yearly amounts. A Botanic Garden 

 Sycamore of the older set ]N"o. 28, upwards of 5 feet in girth 

 in 1891, increased at the rate of only 0"31 in fourteen years, 

 although rather fine-looking, with a fair head of healthy 

 foliaoce, and well sheltered in the west border of the Garden. 

 No. 13, the largest Sycamore in the Arboretum, a still 

 handsome though failing tree, above 11 feet in girth, did 

 not much worse than this, its rate having been 0'26 for 

 thirteen years ; but No. 7*, nearly 11 feet in girth, in the 

 Park at Craigiehall, had the better rate of 043 for twelve 

 years. 



The annual range, particularly of Ko. 74, 0"70 to 1"55, 

 was high. 



No. 21. Cttisus Laburnum. No. 19. Crat.egus Oxyacantha. 



Cytisus Laburnum. In the south belt of the Arboretum. 

 It seemed to be healthy, and its rate was apparently un- 

 affected by profuse flowering in two seasons. The rate, 0'82, 

 may be normal for a sandy soil, as the range was not 

 excessive. 



Cratcegus Oxyacantha. In the south belt of the Arboretum, 

 sheltered but not pressed by other trees. Its annual rate 

 was 1*06 ; that of the handsome weeping Thorn, No. 16, in 

 the Botanic Garden, a much older tree, nearly 4 feet in 

 girth, was 0*56 for fourteen years ; and as this rate was 

 maintained in the last four years, its vigour does not seem 

 to diminish. The range of No. 19 was great, 0"70 to 1'65, 

 and the latter amount in a single year indicates that the 

 Hawthorn may grow very rapidly even in a thin sandy 

 soil. 



