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BOOK REVIEWS 157 To most biologists, however, the chief interest of this start, suggesting a routine exercise in diffusion methods, correspondence will be the light it throws on Darwin's gradually works up to a most interesting discussion on work on the species question. It is known from other coupled amino acid substitutions during the evolution sources that Darwin opened his first notebook on the of a given protein. He also contributes an autobio- transmutation of species in July 1837, that he read graphical memoir; further biographical notes are given Maithus' essay during September 1838 and that he wrote by James Crow. The remaining 27 papers, which range the pencil sketch of his species theory whilst staying at from very readable to severely technical, cover a wide Maer and Shrewsbury in the summer of 1842. There is range of topics in population genetics and evolution, no doubt, therefore, that throughout virtually the entire mainly at the molecular level. While many of the authors period covered by the correspondence published in the are not unreservedly neutralist, a contribution from the present volume, Darwin was actively working on the extreme selectionist school would have helped the book species question. Those readers who anticipate that there to be, as the editors hope, an interesting guide to modern are many letters in this book that provide direct and population genetics. The papers are, in nearly all cases, unequivocal evidence of Darwin's thinking about this of a high standard. Those who are happiest with experi- question will, however, be disappointed. The alert reader ments will particularly enjoy the paper by Hartl and will, nevertheless, spot some important clues, the earliest Dykhuizen, summarising their work on enzyme variants of which occurs in a letter to Lyell written on 14 Septem- in E. coli. One may guess, with confidence, that Kimura ber 1838 in which Darwin says that "I have lately been enjoyed the Seminar. Many happy returns! sadly tempted to be idle, that is as far as pure geology is concerned, by the delightful number of new views, J. S. GALE which have been coming in, thick and steadily, on the Department of Genetics classification and affinities and instincts of animals— University of Birmingham bearing on the question of species—notebook, after notebook has been filled, with facts, which begin to group themselves clearly under sub-laws". Other clues can be found in letters to, among others, Henslow (Sep- The evolution of DNA sequences. B. C. Clarke, A. tember 1839) and his cousin Fox (January 1841). But, Robertson and A. J. Jeifreys (eds). The Royal perhaps, the most important evidence is to be found in Society, London. 1986. Pp. 354. Price £29.00 (U.K. correspondence with Herbert (April 1839) on the effects addresses), £31.00 (overseas addresses). ISBN of hybridisation in plants; with Waterhouse (July- 0854032622. August 1843) on the principles of classification; and a questionnaire about the effects of crossing in animals The volume of literature dealing with DNA sequence that Darwin had printed and distributed early in 1839 data is so large that any book on the subject that contains to a number of animal breeders (Appendix V), two less than 170 leaves is to be welcomed. Thus this volume replies to which are included in this correspondence. retains its appeal despite the passage of 2 years since There is much else besides scientific correspondence the symposium was held. It contains a collection of in this volume, among which that between the members articles, of a generally high standard, on areas of current of Darwin's family and his Wedgwood cousins, includ- interest in molecular evolution. The articles fall into two ing, of course, Emma, is fascinating for the close and categories—those which survey a field of work and those warm relationships, and the social life of the times, it which concentrate on one particular aspect. reveals. In short, this edition is a major work of scholar- Thus, in the first category Kimura provides a useful ship which is impossible to praise too highly and which supplement to his excellent book; Bostock discusses will serve as a rich treasure house for scientists and DNA amplification Brookfield, transposable elements historians alike for many years to come. and Avise gives a fascinating review of the population genetics of mitochondrial DNA. HartI and his colleagues MICHAEL LAWRENCE deal with plasmids in bacterial populations and Engels assesses our state of knowledge about the phenomena Department of Genetics which have come to be known as "hybrid dysgenesis" University of Birmingham in Drosophila. Engels shows that while we may know much about the elements responsible, there is a lot we still do not understand about the phenomena they cause. Population genetics and molecular evolution. In particular, we have no clear idea why there are strains Tomoko Ohta and Kenichi Aoki (eds). Japan of D. melanogaster which lack P elements completely, Scientific Societies Press, Tokyo and Springer- or rather, in Engels' words: "we have reached... the Verlag, Berlin. 1985. Pp. xvii+ 503. Price DM 118. paradoxical conclusion that all possible explanations should be discarded". ISBN 3 540 15584 8. The other contributors to this volume take the second This collection of papers is based on contributions to a approach, concentrating more on one particular com- Seminar commemorating Kimura's sixtieth birthday. ponent of their field. Fitch discusses methods of analysis The Master himself is in fine form; a somewhat deceptive of nucleotide sequence data which allow for different 158 BOOK REVIEWS rates of transition and transversion. He concludes that than 30 years ago in Demerec's Biology of Drosophila. all current methods are biased, although some perform Poulson's article has aged well, not least because of the better than others. The source of the bias, he suggests, excellence of his embryology, but Demerec's book has is an uneven distribution along nucleotide sequences of been out of print for years. Although many fly labs the probability of substitution. Bodmer et al. discuss probably have a dog-eared copy of Poulson's article, we recombination and gene clusters in the human genome do indeed need "a comprehensive monograph on the with particular reference to HLA genes. Smithies and morphology of embryonic development in the fruitfly" Powers are also concerned with the nature of recombina- to take account of the work which has been done since tion events and conclude that a large number of very 1950 and the much wider audience which now exists for small gene conversion events have occurred in the anything connected with Drosophila. human gammaglobin region. Several of these are iden- Whether Campos-Ortega and Hartenstein have tified apparently on the basis of single or double nucleo- actually produced what we want is of course another tide substitutions. They do not, however, consider the matter. The framework on which their book rests is a possibility that uneven mutation rates would also detailed description of embryonic stages in living and generate this type of event. The quantitative background fixed embryos. Each stage is represented in a summary to the processes are not considered in this paper or, diagram, in photographs of living embryos and in sec- surprisingly, in that by Bodmer. tions of fixed embryos embedded in plastic. The text is While R. B. Flavell provides a useful and informative written in a quaint and idiosyncratic version of English discussion about satellite DNA and plant chromosome but the sectioned embryos are very good indeed, and at structure, McGregor attempts to ask the "right ques- its best, the book serves as a guide to the sequence and tions" about satellite DNA. What he did not answer was pattern of events in the developing embryo which can "why newts?" Finally, Dover and Tautz continue the rapidly and successfully take the unitiated from the sort pattern of providing a useful introduction to their area of embryo they might find in the bottom of a petri dish of interest, but anyone who is familiar with the senior to the fine details of development in particular organ author will not be surprised to find not one but three systems and tissues with which they are concerned. The disparate fields being introduced in the same article. difficulty is that the material the authors deal with is They are all, of course, revolutionary or, at least, not almost exclusively their own, and while this gives them conventionally Darwinian. One of these is "molecular the advantage of covering familiar ground, it also pro- coevolution". This refers to epistatic fitness effects duces curious gaps in the subject. For example, the book between genes whose products form a functionally inter- is almost entirely about the development of larval cells, acting unit. Put that way, though, it sounds rather too even though the setting aside of the adult cells is a "Darwinian". distinctive and rather important aspect of embryogenesis This is definitely a useful collection of articles. Some in a holometabolous insect. of them will age more rapidly than others, but all should Techniques which were never available to Poulson remain useful for another few years. are rapidly improving our knowledge of the first 24 hours in the life of the fly. The field is now moving so quickly ANDREW LEIGH BROWN that the authors must have known from the outset that Department of Genetics the book was bound to be flawed in its details and it University of Edinburgh will be up to them to improve it if it goes into another edition. For the moment they have given us their version of fly embryology. There will be other versions, but for better or worse theirs is likely to be the standard reference for Drosophila embryology for some time to come.

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