Published online by Cambridge University Press: 28 February 2022
Interest in and detailed studies of development go back to Aristotle, and antedated serious work on evolution. In the 19th century, theories of and information about development played a significant role in evolutionary thought. This wave reached a crest with Emst Haeckel's late 19th century attempted fusion of evolutionary and developmental ideas through the study of comparative embryology via his ‘Biogenetic law’ that ‘Ontogeny recapitulates phytogeny.’ With the rise of experimental methods for studying development, and the separation of the study of heredity from that of development leading to the birth of genetics as a separate discipline, Haeckel's views fell out of favor by the first decade of the 20th century as evolutionary thought took on new directions. (See, e.g., Allen 1979, Gould 1977, and the essays by Hamburger and Churchill in Mayr and Provine (1980)).
The order of the authors was determined alphabetically. Although Wimsatt is primarily responsible for sections 1-5, and Schank for sections 7-12, both contributed substantially to the writing and content of most parts of the paper. The first part of this paper is the latest espression of a research project which began 14 years ago, and has benefitted from countless criticisms and suggestions. Those whose names should be added to the list found in Wimsatt, 1986, include Wallace Arthur, Dick Burian, Brian Charlesworth, James Crow, Elihu Gerson, James Griesemer, Dick Lewontin, Craig Loehle, Jane Mainschein, Will Provine, Rudolph Raff, Nick Rasmussen, Sahotra Sarkar, and Leigh Star. Figure 2 is used by courtesy of Nicholas Rasmussen. The simulations described in the second part were done in ExperLisp™ and ExperCommonLisp™ on an Apple Macintosh™ computer. This hardware and software has allowed us to construct and to simulate models of substantial complexity in reasonable time at very low cost which would have otherwise required hundreds of hours on a mainframe or minicomputer. (Truly the microcomputer revolution has arrived!) For the second part, we would both like to acknowledge the crucial inspiration and insight, now extending over 18 years, and the more recent consultations, help, and counsel of Stuart Kauffman, who has shared freely, not only of his informed opinions and conjectures, but also of his current research problems and ideas. It is too little to say that without him this part of the paper could not have been written, for without him, the subject matter and the methods for approaching it would not exist.