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1. Oahu includes a striking variety of ecologic areas. For 

 example within a radius of half a dozen miles of the College 

 of Hawaii campus occur the following well-defined ecological 

 districts : 



1. Alanoa Valley — one of the largest of the Oahu valleys. 

 with a large amphitheater of erosion; broad, fiat floor; and 

 precipitous, ridged walls. 



2. Waikiki Flats — extensive coastal plain, artificially flood- 

 ed, and planted with various wet-land crops. 



3. Kaimuki Region — secondary volcanic craters, with lava 

 flows and volcanic debris. 



4. Extinct craters of Diamond Head, Punchbowl, Round- 

 top, Sugar-loaf, Tantalus and Kaau. 



5. Coral Reefs — lagoons and fringing reefs, along the en- 

 tire southern coast of Oahu ; rich in marine life. 



6. Waialae — an arid portion of the coastal plain, with 

 tongues into the valleys adjacent. 



7. Koolau Range — average elevation 2200 feet, with dense 

 indigenous rain-forest. 



8. Introduced plantings — eucalyptus, prosopis, etc.. in ex- 

 tensive groves and woodlands. 



9. Strand regions — comprising coral, lava and tufa beaches. 



10. Valleys and streams — Moanalua, Kalihi, Nuuanu, Pau- 

 oa. Makiki, Manoa. Palolo, Waialae, etc. 



11. Foothills and ridges — eroded remnants of the original 

 Koolau volcanic dome. 



12. Caverns and "lava tubes" — formed chiefly through for- 

 mer volcanic action. 



13. Deep Sea — at a relatively short distance from the shore 

 line. 



This list is not complete nor detailed, but it will serve to 

 indicate the unique variety of life-conditions. 



2. The various parts of the island are easily acccessible. 

 To quote a previous article : 



"From the standpoint of collegiate studies, all of these re- 

 gions are quite accessible ; many of them are within half-day's 

 walk, and the most remote can be reached within a day. In 

 addition to the system of public roads, plantation roadways, 

 wagon trails, and foot trails, there are two railway lines, a 

 number of stage lines, and motor car services. There are also 

 available a number of excellent maps, including trail maps. 

 Food supplies and drinking water are obtainable throughout 

 the island. It is therefore a relatively simple matter to make 

 an expedition to any given region, to transport needful scien- 

 tific apparatus and equipment, and to continue the studies and 

 collecting for as long a period as is desirable. 



There is perhaps no other region in the world, similarly 

 blessed with all of the conveniences of modern civilized socie- 



