162 H. G. SMITH. 



slackened, after which time it reverted to the original rate, 

 but the leaves were all petiolate as in (B). (C) shows the 

 venation of the mature petiolate leaves. This Eucalyptus 

 leaf venation indicates that the oil consists of cineol and 

 pinene and that phellandrene is absent. 



The rapidity of growth in localities away from the natural 

 home of the species is illustrated by results obtained with 

 a tree grown in my own garden at Marrickville, near 

 Sydney. In January, 1912, seedlings, a few inches high, 

 were brought from Hill Top. One of these grew very well, 

 and by the end of the winter, in August of that year, was 

 two feet three inches high. Measurements were then 

 made every week until the end of December. During the 

 month of September the height increased seven inches; 

 during October the tree grew twelve inches; during 

 November it grew fourteen inches, while at the end of 

 December the height of the seedling was six feet. In 

 January 1915 the height of the tree was twenty-two feet, 

 while the diameter of the stem, eighteen inches from the 

 ground, was three inches. In June of this year the top of 

 the tree was removed and the leaves distilled for oil. The 

 natural home of E. Smithii is on the Ranges, and at a 

 considerable altitude, while Marrickville is near sea level. 

 The yield of oil from this cultivated tree was practically 

 equal in amount to that from naturally grown trees, (1*5 to 

 2 per cent.), and the quality of the oil and its constituents 

 were also in agreement. This is shown from the tabulated 

 results below. 



The Essential Oil. 

 This investigation of the oil of Eucalyptus Smithii, dis- 

 tilled from material collected under different conditions of 

 growth, was thought desirable in order that the variations 

 in the amounts of constituents in the oil during these 



