The objective of this book is to reconstruct historical episodes and experiments that have been important in scientific progress, and to explore the role played by controversies and rivalries among scientists. Although progress in science has been replete with controversies, scientists themselves either ignore or simply downplay their role. Such presentations lack the appreciation of the dynamics of 'science-in-the-making'. This book provides methodological guidelines - based on a historical perspective of philosophy of science- that facilitate an understanding of historical episodes beyond that of inductive generalizations. These guidelines suggest that progress in science is not merely based on the accumulation of experimental data, but rather dependent on the creative imagination of the scientific community. This work shows that interpretation of experimental data is difficult and inevitably leads to alternative models/theories thus facilitating the understanding of science as a human enterprise.

Zusammenfassung
It is generally believed that doing science means accumulating empirical data with no or little reference to the interpretation of the data based on the scientist's th- retical framework or presuppositions. Holton (1969a) has deplored the widely accepted myth (experimenticism) according to which progress in science is presented as the inexorable result of the pursuit of logically sound conclusions from un- biguous experimental data. Surprisingly, some of the leading scientists themselves (Millikan is a good example) have contributed to perpetuate the myth with respect to modern science being essentially empirical, that is carefully tested experim- tal facts (free of a priori conceptions), leading to inductive generalizations. Based on the existing knowledge in a field of research a scientist formulates the guiding assumptions (Laudan et al. , 1988), presuppositions (Holton, 1978, 1998) and hard core (Lakatos, 1970) of the research program that constitutes the imperative of presuppositions, which is not abandoned in the face of anomalous data. Laudan and his group consider the following paraphrase of Kant by Lakatos as an important guideline: philosophy of science without history of science is empty. Starting in the 1960s, this historical school has attempted to redraw and replace the positivist or logical empiricist image of science that dominated for the first half of the twentieth century. Among other aspects, one that looms large in these studies is that of guiding assumptions and has considerable implications for the main thesis of this monograph (Chapter 2).

Inhalt
Quantitative Imperative Versus the Imperative of Presuppositions.- Understanding Scientific Progress: From Duhem to Lakatos.- Kinetic Theory: Maxwell's Presuppositions.- Periodic Table of the Chemical Elements: From Mendeleev to Moseley.- Foundations of Modern Atomic Theory: Thomson, Rutherford, and Bohr.- Determination of the Elementary Electrical Charge: Millikan and Ehrenhaft.- Paradox of the Photoelectric Effect: Einstein and Millikan.- Bending of Light in the 1919 Eclipse Experiments: Einstein and Eddington.- Lewis's Covalent Bond: From Transfer of Electrons to Sharing of Electrons.- Quantum Mechanics: From Bohr to Bohm.- WaveParticle Duality: De Broglie, Einstein, and Schrödinger.- Searching for Quarks: Perl's Philosophy of Speculative Experiments.- Conclusion: Inductive Method as a Chimera.