342 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
many other palms, is not tolerant of shade nor of long continued cool 
and cloudy weather. Other species of Cocos that are less exacting 
in their requirements of sunlight and heat have been found to do 
well along the California coast. 
The possibility of introducing coconut palms into southern Cali- 
fornia is not disproved by the absence of these palms from Egypt 
and Palestine. Though the climatic conditions are probably favor- 
able, it does not appear that any adequate effort has been made to 
introduce the palms in those countries. 
The ability of the coconut to thrive on seacoasts shows that its 
requirements of heat are not as great as those of the date palm. 
Though probably less hardy than the date palm, it is not impossible 
that the coconut may be able to exist in frost-free localities that have 
not enough heat for the ripening of dates. 
The possibility of introducing the coconut palm into southern 
California and Arizona can not be fairly tested by the planting of 
the maritime varieties. The chances of success will be very much 
ereater with the varieties that are adapted to the dry interior locali- 
ties of the temperate plateaus of the Andes. 
