Stokes has a point. It is an important insight and I teach it in my Economics of Technology class. It is that the usual basic vs. applied research dichotomy is incomplete and misleading. The main innovation of the book is to look at two main motives of researchers independently: one motive is a "quest for fundamental understanding" and the other is "seeking practical use."
When he places each of these two motives on the two axis' of the cartesian plane, he gets a four-fold categorization of research activity (instead of the binary distinction between basic vs applied), based on whether each of the motives hold for the research project: pure basic science (Bohr's quadrant) and purely applied research (Edison's quadrant) were what we recognized before. But then, a third category emerges, in which the "quest for fundamental understanding" and "seeking practical use" are both present and are inseperable. This is the Pasteur's quadrant, and many fields of scientific/technological activity in which the two (science and technology) seem to be inseparable and un-delimitable reside here. Biotech and nanotech, perhaps areas in cryptography, ...etc. Good, useful insight, and all is good and well.
But then, Stokes streches his argument, and this is where things get quite murky: the philosophical moment in human history when Thales rejected mythical explanations in favor of logical reasoning, becomes analogous to the "invention" of "practical use" (as opposed to pure understanding). The social and historical conditions that led to the basic-applied distinction become mere ideology. This unclear and confused train of thought extends to his thinking in the later chapters. In seeking the implications of his main idea, Stokes isn't careful, and is not very thoughtful, either. Hence, where the original argument is stretched, he fails spectacularly.
At the end of the day, his proposal is to use the "Pasteur's quadrant" as a strategic tool to leverage resources for basic science, against a policy-making community that is more and more bent on seing immediate and applicable (read: commercial) results out of research, and is intent to distribute resources accordingly. Pure basic research is in danger in our world, and Stokes is not happy with this. The problem, though is that the "Pasteur's quadrant" was not a very dangerous space for scientists in the first place; what is truly in danger is "Bohr's quadrant" to begin with, and Stokes thinks that he can save the scientific descendants of Bohr and Einstein from the hellpit of commercial interest as well. So, instead of the usual Vannevar Bush argument that "basic research eventually leads to critical economic uses," he suggests that "pure basic research eventually leads to activity in the Pasteur's quadrant." He thinks he can save pure basic research per this argument. Unfortunately for all of us, he cannot.
Not a bad book overall, but I couldn't get myself to give it the third star.