Tree Meamirements at San Jorge, Untguay. 461 



the five months, May to September ; and the Acer no growth 

 at all for those five months. 



Table No. IV. — Showing the Monthly Averages of hicrease of Girth 

 and Percentage of Increase for the eight Evergreens in Table 

 No. I. ; for the eight Deciduous Trees in Table No. II. ; and 

 for the four older Deciduous Trees in Table Xo. III. — cdl for 

 five years. 



Table No. IV. represents the averages of each of these 

 three groups, showing that in eight evergreens most growth 

 occurs in October and least in July; that in eight young 

 deciduous trees there is most growth in December, and that 

 there is a general decrease of girth in May. The same is 

 the rule for the group of four older deciduous trees. 



I also present the Table No. V., which shows the girths 

 of each individual tree at January 12, 1885, and at January 

 12, 1890, the increase of each tree, and the average annual 

 increase — all in millimetres. 



The considerable discrepancies in growth shown by in- 

 dividuals of some species are remarkable. The two examples 

 of Acacia mollissimcL are on the same slope of ground, about 

 20 yards apart, were planted in 1882, and would thus be 

 eight and a half years old, January 1890, being one year 

 seedlings when planted. The two pines are not near each 

 other, nor on the same slope of ground, the second pine 



