291 



been planted or sprung up self sown on its north side, which bear the 

 numbers 807 to 819 and 1997 to 21 13 and younger unnumbered trees 

 are in its South-east conrer. Six were placed in 1908 in rotation M 

 and two used in 1910 for replacing losses in rotation J. 



Block 12 was planted up with Hevea in 1913 and has not been 

 tapped yet. The trees bear the numbers between 3101 and 3511. 

 Between every two rows is a ditch. The planting is regular. In 

 1913 the trees row by row were manured in different ways, otherwise 

 they have all had the same treatment and are all of the same age. 



Block 13 contains two rows of old rubber trees, bearing numbers 

 between 1232 and 1254, and between 21 16 and 2129, as well as some 

 quite young trees. The old trees were planted in 1896 and 1897. 

 All of them were tapped for 1909, in rotation M, but a few had been 

 tapped in 1907, in the experiment W versus V. 



Hevea trees occur in three groups on the Arboretum slopes. 

 There are trees I2I2 to 121 5 close to the Economic Garden office, 

 trees among which are Nos. 1255, 1256 and 2191 near the Dalvey 

 road, and trees Nos. 1257 to 1281 and 2215 to 2248 near the Assistant 

 Curator's quarters. There is also one numbered tree in the Botanic 

 Gardens in the part nearest to the last, No. 1283. The number of 

 then scattered trees used to be larger for very many associated trees 

 were removed in 1911, on the building of the Assistant Curator's 

 house. Most of such as still stand were tapped by Mr. Burgess in 

 1905. One was in rotation J from 1904 of another was used to replace 

 a lost tree in rotation J from 1905, a third to replace a lost tree in 

 rotation B from the same year, a fourth from 1909 in rotation G, 

 and a fifth from 1912 in rotation M. 



The number of trees in the Garden, which have been registered 

 was about three thousand and three hundred, but the standing trees 

 are now about three thousand. Latterly in trying to improve the 

 plantation the removals have been considerable. In the following 

 table an attempt is made to bring into one view the changes which 

 have occurred in the number of trees of ten years and upwards. As 

 regards most of the trees the age is fairly well known ; it was record- 

 ed by Mr. Derry in a book, in the year, 1904, as stated in the Annual 

 Report of the Botanic Gardens of that year ; and similarly the age is 

 known of the youngest trees ; but there are a number of self-sown 

 trees the age of which is uncertain. Judging from the girth measure- 

 ments recorded in 1904, 1906, 1907 and 1909, these trees for the 

 purpose of the table have been assigned to probable years; and 

 though as regards individual trees the error may be considerable, as 

 regards the trees taken collectively it is probably small. The deaths 

 were not recorded before 1904, and are known approximately only for 

 the year 1903. Allowance has been made fur, a fair proportion. 

 From these trees seed crops have been collected as stated in 

 tables. 



