Here's Matthiessen on a trip to the last continent, as thoughtful, informative and provocative as ever. He describes with lyrical intensity the power of the open ocean, rugged beauty of Antarctica, and abundant wildlife at the end of the Earth. He also considers global warming and its potential impacts. A veteran of two voyages, he traveled from Ushuaia to South Georgia and the Antarctic Peninsula on a converted Russian research vessel.  (ANT190, $15.00)