8 
BULLETIN 5 9, HAWAII EXPERIMENT STATION 
varieties indicate the necessity for a more resistant root system. 
In the Hawaiian Islands such root troubles may be brought about by 
either pathological or soil conditions, but as yet these factors have 
not been a cause of concern in the culture of the Macadamia. In 
Figure 4. 
-Germinated Macadamia nuts indicating that position of seed is not 
necessarily the cause of crooked seedlings 
semitropical countries where the culture of the Macadamia is to some 
extent being tried, the matter of resistance of the tree to cold, and 
particularly of the root system to low soil temperature, may also be 
a subject for investigation of the use of more resistant rootstocks. 
