32 JOURNAL OF FORESTRY 



The effect of the high temperatures and low humidity upon the trees 

 was to cause them to wilt rapidly. Trees that were able to obtain water 

 fast enough and in sufficient quantities were uninjured ; those that were 

 not quite able to cope with the situation were partially burned ; the 

 moisture was removed from all the leaves and twigs of those imable 

 to meet the demands, as the drain was made upon the whole system, 

 no adventitious buds were put out to correct the trouble later. 



The trees that died were located in places where they were fully 

 exposed and where the full force of the desiccating wind was felt. 

 These trees were dried to such a degree that, when they were examined 

 a short time later, all parts of the stem appeared to be thoroughly 

 seasoned. The trees whose foliage was the only part entirely killed 

 had some protection from the full force of the w^ind ; and, although a 

 number of the twigs and smaller branches were killed, the rest of the 

 tree was not dried past recovery, and new leaves were soon put out 

 and an occasional adventitious shoot. In the more severe cases of 

 defoliation, the losses were confined almost entirely to the upper part 

 of the crown and the fringe of leaves on the periphery of the crown, 

 though a few twigs and small branches were killed. The recovery from 

 this damage was indicated by the appearance of new leaves on the live 

 stems, though the upper part of the crown produced fewer than did 

 the lower portion of the tree. Occasional adventitious shoots on the 

 larger branches and in the upper part of the crown were formed. 

 Where the injury was slight, it was confined to the killing of entire 

 leaves at the tips of the branches or in the tops of the trees ; whereas 

 the cold damaged the tips and edges of the leaves more often than the 

 entire leaf. Recovery took place most quickly on the areas where irri- 

 gation was practiced and where the trees could derive the benefit from 

 water applied to the adjoining crops. 



GENERAL CONCLUSIONS 



The effect upon the trees of being subjected to this period of sudden 

 drought is interesting because of the- information it gives about the 

 behavior of the different species. While eucalypts have been planted 

 under many diverse conditions, little has been done to summarize the 

 results of experience, and what species are successful under given 

 circumstances is not generally known. 



It appears from the above general observation that eucalypts can 

 better withstand untoward conditions if they are planted in loamv soils 



