I thought this was going to be one of those toilet books - dip in and dip out, with short articles about each bit of 'discarded science', whatever that meant. I don't read in the toilet. I hate that kind of book.
Instead, it was actually very good! Grant resisted the temptation to only write about the weird, or the amusing; theories that were genuinely scientific, but just happened to be wrong, are included alongside the ones that were totally crackpot, deluded or (in my opinion) downright evil. It reads less as a list of failed scientific theories as a narrative of the development of scientific thought, and as such it is encouraging. The truth will out! It appears, in the naive innocence of my youthful mind, that science tends to progressively evolve towards accuracy, no matter how much ideology/nationalism/religion/arrogance/negligence/sheer, unadulterated stupidity tries to stop it. After I say this I step back and survey the glittering constructs of my idealism, ready at any moment for them to be struck down by the obscure armies of bitter experience.