460 



Mr Charles E. Hall on 



has its own month for chief growth, varying from November 

 to February ; and in all the rise and fall to and from the 

 maximum is regular, with trifling exceptions. 



The May decrease in girths is noticeable ; it occurs in all 

 the species, and a month before the three months of com- 

 parative rest in the evergreens. With the exception of May, 

 and, in the case of the Lombardy poplars, July, there is no 

 month that does not show a slight increase in one or more 

 species. But the nett growth for the six months, April to 

 September, is, for Lombardy poplar, only 2 per cent, of the 

 annual increase, and for Acacia Bobinia 5^ per cent ; for the 

 five months, April to August, the nett growth of Paraiso is 

 only 5 per cent., and for the oak for the same five months 

 only 2 per cent., and only 3 per cent, for the six months, 

 April to September. 



Table No. III. — Monthly Increase in Girth and Proporiion of 

 Increase for each Month in the four older Deciduous Trees, for 

 five years, from 12th January 1885 to VMh January 1890. 



Table No. III. — The old Paraiso does grow, but very 

 slowly ; the Eobinia grows very irregularly, and shows 

 numerous decreases. The Acer grows most in December, 

 and the cottonwood in January. The cottonwood shows 

 absolutely only 1 per cent, of the total annual increase in 



