of great consequence because outside of the summits of the three 

 highest mountains on the Islands the temperature everywhere 

 in the Territory is sufficiently warm for the growth of Euca- 

 lyptus. 



Several species of eucalypts have been planted within the last 

 three years on the west slope of Haleakala, on the Island of 

 Maui, at an elevation of between 6,000 and 6,500 feet, and a 

 number of them are doing very well, notably the peppermint 

 gum (E. amygdalina), the blue gum (E. globulus), the moun- 

 tain ash (E. siberiana), and the broad-leaved ironbark (E. 

 siderophloia). Here the temperature is almost never lower than 

 35 F. How much higher than 6,500 feet these trees would 

 grow it is difficult to state, but there is no reason to believe that 

 the temperature would be too low for a proper growth of the 

 eucalypts at elevations as high as 7,000 or 8,500 feet, since the 

 thermometer rarely drops below 32 F. 



The temperature and moisture conditions most favorable to 

 the growth of Eucalyptus in Hawaii are an abundant rainfall, 

 say between 50 and 100 inches per year, and a rainy season 

 alternating with plenty of strong, warm sunshine. Prolonged 

 rain suddenly followed by intense sunshine and heat is injur- 

 ious, especially to seedlings. 



The eucalypts are intolerant of shade and require plenty of 

 light for their proper development. When given too much 

 light, however, the eucalypts will branch out immoderately and 

 will then not be of much value as timber trees. The trees in 

 their seedling stage can endure more shade than the older trees, 

 and the very young seedlings require a certain amount of shade 

 for their growth. When all planted at the same time, the euca- 

 lypts can grow in dense stands, and the trees will then form 

 straight, cylindrical trunks. They will not grow, however, 

 planted in the shade of other trees. 



Most of the eucalypts have well-developed root-systems, and 

 as a rule are not easily thrown by ordinary winds, but the foliage 

 of many of the gums is affected by strong winds, and few species 

 can therefore thrive in windy situations. The trees seem to 

 suffer more by constant than by unusually strong winds, and 

 the ordinary trade wind in an exposed situation will be more 

 harmful than an occasional kona -storm. The foliage of blue 

 gum (E. globulus) and red gum (E. rostrata) is particularly 

 sensitive to strong winds. Sugar gum (E. corynocalyx) and 

 peppermint gum (E. amygdalina) can stand much wind, though 

 the trees will often lean to leeward and are then unfit for 

 straight timber. The swamp mahogany (E. robust a) is gen- 



