how natural selection acts on genes in an 

 organism, he suggests Richard Dawkins's 

 The Selfish Gene (Oxford: Oxford Uni- 

 versity Press, 1989). Werren also recom- 

 mends R. R. Askew's book Parasitic In- 

 sects (London: Heinemann Educational 

 Books, 1973), which provides fascinating 

 life histories of the many species that, like 

 the jewel wasp, live at the expense of 

 their hosts. 



Jeremy Jackson (page 56) is director 

 of the Smithsonian Institution's Center for 

 Tropical Paleoecology and Archeology at 

 Balboa, Panama. Ever since earning his 

 doctorate in geology at Yale University in 

 1971, Jackson has been studying bry- 

 ozoans, mollusks, and corals in the waters 

 off Jamaica, Panama, Costa Rica, 

 Venezuela, Guam, and Truk. Before join- 

 ing the Smithsonian in 1984 as a senior 

 scientist, he also served as professor of 

 ecology at Johns 

 Hopkins Univer- 

 sity. An expert on 

 living as well as 

 fossil inverte- 

 brates, Jackson 

 has documented 

 the effects of oil 

 spills and other "anthropogenic" damage 

 to the oceans. This month's article had its 

 genesis when Jackson read coauthor Alan 

 Cheetham's manuscript about punctu- 

 ated equilibrium of bryozoans. "I won- 

 dered to him out loud whether or not the 

 'species' he created by his statistical 

 hocus-pocus had any biological validity," 

 Jackson recalled, "so we wrote a grant 

 proposal together to put his career on the 

 line." Cheetham (below), whose doctorate 

 from Columbia University (1959) is in 

 paleontology, is currently a senior re- 

 search geologist at the National Museum 

 of Natural History in Washington, D.C. 

 During forty years of work on the system- 

 atics of bryozoans in the United States, 

 Scandinavia, England, and France, he has 

 sought methods of inferring patterns of 

 evolution from the fossil record. 

 Cheetham's hobby is woodland gardening 

 near a small tributary of the Potomac, 

 where he grows 

 such native 

 plants as "May 

 apple and yellow 

 violets, which, 

 like bryozoans, 

 grow in modular 

 aggregates." 



American Museum of Natural History mm^mmm 



Train Journeys 



BEIJING TO MOSCOW 

 September 15-30, 1994 



The legendary Trans-Siberian is one of 

 the greatest railways in the world. Join a 

 team of American Museum lecturers this 

 September for a 5,300-mile journey from 

 Beijing to Moscow. Tracing the ancient 

 route of the tea caravans, we will travel 

 through the vast Gobi, the Mongolian 

 steppe, the expansive Siberian taiga and 

 along magnificent Lake Baikal. We will 

 also explore numerous Siberian cities, 

 frontier towns and traditional Mongolian 

 ger camps, as well as the great cities of 

 Beijing and Moscow. 



BEIJING TO HANOI 



with an optional extension to Angkor Wat 



October 25 - November 12, 1994 



Since the time of Marco Polo, the cultural riches and natural wonders of 

 China have intrigued visitors. Lesser known are the riches of neighboring 

 Vietnam. This October, enjoy the spectacular landscapes of rural China and 

 Vietnam and a rare look at other cultures as we travel from Beijing to Hanoi 

 with a team of Museum experts. Among the highlights of our journey are 

 the terracotta soldiers of Xi'an, the Stone Forest of Kunming, the lovely Li 

 River and the Red River Valley of Vietnam. 



^^Yaroslavl RUSSIA 



Moscow 



J Novosibirsk J 



^^A • ^^^^%^. Ulan irde- 



itilatii Bator 



I 



^MONGOLIA-.. 



CHINA 

 Chengdu 



American 

 Museum of 

 Natural 

 History 



Discovery Tours 



Central Park West at 79th Street 

 New York, NY 10024-5192 



Toll-free (800) 462-8687 

 (212) 769-5700 in New York 



103 



