TEMPERATURE 73 



that the surface of the ocean may be divided 

 into five zones, viz. a zone of small range 

 and high temperature encircling the tropical 

 regions, two zones of small range and low 

 temperature encircling the two polar regions, 

 and two intermediate zones of large range 

 encircling the two temperate regions of the 

 globe, 



A range not exceeding 10° F. occurs in the 

 Arctic Ocean, bordering the northern shores 

 of Asia and America mostly within the Arctic 

 Cu'cle, and in the Antarctic Ocean as far north 

 approximately as latitude 50° S. Throughout 

 these two polar areas the observations indicate 

 a range from 28° to about 50° F., though not 

 exceeding ten degrees in any single two- 

 degree square, and in certain squares being 

 less than five degrees. 



A range not exceeding 10° F., but with 

 high temperature, occurs also in an almost 

 continuous intertropical belt around the globe, 

 broken only in the Pacific off the western 

 shores of Central America ; in the central 

 portion of the South Pacific this belt extends 

 as far south as lat. 30° S. The observations 

 recorded throughout this belt vary from 70° 

 to 90° F., though the range in any single two- 

 degree square does not exceed 10° F. This 

 practically embraces the coral-reef regions of 

 the world. 



