Mar. 1892.] THE BOTANICAL SOCIETY OF EDIXBUKGH. 265 



No. 8. Alxus glutinosa. No. 96. Salix sp. 



* This amount appears to be too small, because the point of measurement was 

 shifted from near the ground to 5 feet up, as the infant stem grew. 



■ Alnus glutinosa. Sheltered by other trees in the south 

 belt of the Arboretum. 



Its annual rate, 0"82, has been lowered by some special 

 cause in 1890, when the increase, 0"55, was less than half 

 that of the previous year, 1'20, and it did not quite recover 

 in 1891. In both years the foliage looked diminutive and 

 shabby. The rate for the previous three years was 0"95. 



Salix sp. In the Osier bed near the pond in the Botanic 

 Garden. 



Its annual rate, 1"50, will probably in future be excelled, 

 as when first measured it was in its infancy, one of many 

 shoots from a common stock, which in 1890 were all pruned 

 away except itself and another. Excluding the first year of 

 infancy, the rate rises to 1'70. 



Nos. 76, 87. PopuLus fastigiata. No. 83. Populus alba. 



P. fastigiata. Both near the outer side of the south 

 belt of the Arboretum. Their annual rate, little above an 

 inch in either, seems low for a fast-growing species, and has 

 apparently been reduced by their participating largely in the 

 depressions of 1888 and 1891. In the latter years the 

 whole of the Deciduous trees suffered a severe fall in girth- 



TRAXS. BOT. see. EDIX^ VOL. XIX. T 



