Why write another small book on respiratory physiology? I have a dozen or so texts on my bookshelf that could already be used interchangeably to teach the subject. For profit, I might as well buy lottery tickets. Not that my publisher is ungenerous, you understand, it's just that the market is not that big and there are many contenders for a share. No, I write from the idealistic standpoint that I think I have something different to say, some- thing that is importantly different about how gas exchange works and with an approach that is different from other authors. With few changes, basically...