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Anthony Mellersh (page 10) first be- 

 came interested in life's earliest chemical 

 evolution as a student at the University of 

 Sheffield, where he earned his medical 

 degree in 1979 and lectured from 1981 to 

 1986. A member of the Royal College of 

 Pathologists, Mellersh is currently a con- 

 sultant microbiologist at Derby City Gen- 



■■■■■■■■KSoini^BlliillBiaMiMa 



As a college student, Andrew Knoll 



(page 14) couldn't decide whether to con- 

 centrate on geology or biology. Upon 

 reading Lynn Margulis's early works on 

 the evolution of eukaryotic cells, he real- 

 ized that he didn't have to choose: by 

 studying the early earth, he could learn 

 how our planet and its biota evolved to- 

 gether. His fieldwork, in search of ancient 

 rocks and the signs of early life they may 

 contain, has taken him to Spitsbergen, 

 Siberia, and other parts of the Arctic, as 

 well as to China, Australia, and southern 



Africa. Back in the United States, where 

 Knoll is chairman of Harvard's Depart- 

 ment of Organismic and Evolutionary Bi- 

 ology, he continues his investigations in 

 the laboratory, hi the future, he hopes to 

 go back to Siberia to learn more about 

 what went on during a major interval of 

 biospheric change about one billion years 

 ago. For a popular account of the inter- 

 twined histories of the earth and its life 

 forms, Knoll suggests 

 E. G. Nisbet's Living Earth (New York: 

 HarperCollins, 1991). 



A native New Yorker who grew up on 

 the pavements of lower Manhattan, Karl 

 J. Niklas (page 22) says his juvenile ex- 

 perience with plants went no further than 

 the salads and vegetables on his dinner 

 plate. Later, as a math major at the City 

 College of New York, NikJas took a 

 botany class from Larry Crockett, whose 

 lectures made him aware of the "intrinsic 

 geometrical beauty of plant shapes." In- 

 spired to enter a new field, he went on to 



Gregory Hurst (below) earned a Ph.D. 

 in 1993 from Cambridge University, 

 where he is now a junior research fellow 

 at Christ's College, which Darwin at- 

 tended. Hurst 

 (page 32) says 

 that although 

 he has long 

 been fasci- 

 nated by in- 

 sects and "pe- 

 culiar" 

 genetics, he 

 was first intro- 



get higher de- 

 grees in 

 botany at the 

 University of 

 Illinois, Ur- 

 bana. Now a 

 professor of 

 botany at Cor- 

 nell Univer- 

 sity, Niklas 

 still looks at 



duced to the odd sex ratios of ladybird 

 beetles, and the shenanigans of the bacte- 

 ria that reside in them, by coauthor 

 Michael Majerus (a. k. a. "the boss"). 

 The two-spotted ladybug continues to 

 provide windows into the evolutionary 

 genetics of parasites; Hurst and Majerus 

 are currently investigating sexually trans- 

 mitted disease in that species. Majerus, a 

 university lecturer and fellow at Clare 

 College, Cambridge, dates his interest in 

 insects back to when he was four years 

 old. He has been doing fieldwork ever 

 since. His new book, Ladybirds, will be 



100 Natural History 6/94 



