Mar. 1892.] THE BOTANICAL SOCIETY OF EDINBURGH. 



289 



Alnus. The half-season increases were exactly equal. 

 June was the best month, with an annual average amount of 

 0"31 and p.c. of 38, but July followed closely, with 0*27 and 

 33. The growth in April and September was hardly 

 appreciable. 



Salix. In its first year, when an infant, the first half- 

 season slightly surpassed the second, but in the other three 

 the second greatly predominated, the general average being 

 as 37 to 63. 



July and August were equal for the best place, the 

 annual average amount in each being 0'40 and the p.c. 26*5. 

 The amount, 015, and p.c, 10, for September are remark- 

 ably high. 



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



