Text Appearing Before Image: GEOGRAPHIC DISTRIBUTION AND ECONOMIC VALUE 455 nected with the mainland, but there are other possibilities to consider. Hurricanes are known to strip trees completely of their leaves and to transport the contents of ponds for varying dis- tances (Visher, 1925). Eggs could be readily carried in the debris, and as adult frogs are known to leap successfully from great heights (Cott, 1926), it is not improbable that they could make an aerial trip successfully. Storms frequently move against prevailing winds and hence would transport Malayan forms into Text Appearing After Image: Fig. 141.—Speciation in Plethodon: (A) Plethodon shermani. Note About Images
Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.
This work is in the public domain because it was published in the United States between 1929 and 1963, and although there may or may not have been a copyright notice, the copyright was not renewed. For further explanation, see Commons:Hirtle chart and the copyright renewal logs. Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.