This is a great glossy overview of processes if you're curious about which to pursue, but not so much use as for practical instruction. James has an approach and writing style in which contradiction and lack of coherent detail(and perhaps even proofing errors) play no small role. Eccentric and charming at first (in a self-edited sort of way) it can be quite maddening if you make purchases or try out processes based on his recommendations and instructions. I'd seriously recommend double checking with other sources once you decide on a process to try out. Of course that's good advice for any source of info, but here it's critical. It's maddening that he'll list creme brulee recipes while be curiously tightlipped about crucial process details. I'm an experienced and largely self-taught printer- carbon transfer, albumen, tri-color gum and kallitype, so I'm not a novice that needs a lot of hand-holding.
A notable irritation is the gum chapter. A typical recipe- 'An 1 1/4 inchworm of watercolor per 12 full eyedroppers of gum and 12 full eyedroppers of dichromate'..? I wouldn't recommend measuring pigment unless you measure in all dimensions -aka volume- not just length. Much more accurate to weigh. And what size eyedroppers? When he does use traditional weights and measures they are inconsistent: he mentions Stephen Livick using 12g of pigment for every 12ml of dichromate when using Sennelier paints, double the concentration of other brands. In a separate section he then says Livick uses 2.5-4g g of Lindel paint in 12ml of dichromate. Forgetting for an instant that 12g of watercolor is an absolutely fantastic quantity of paint (I pigment 4 36x50cm 2mm thick carbon tissues with less- and that's 2 liters worth of solution) I still wouldn't call 12 the double of 2.5 or even 4.
I'm sure he is a wonderful printer, certainly his photographic eye is very good judging by his images, but as an instructor he reminds me of some teachers that give just enough info to engage and tantalize, but not seriously to give you a leg up on their years of toil/hard knocks, and maybe go so far as to play a few hazing tricks on you along the way. The best sections are those contributed by other printers- such as Mark Osterman's section on dry plate. Also much of the prints/ process examples are nice.
I'd been hoping for sections on traditional gravure, or at least photopolymer, also daguerreotype; no such luck. That's just a niggle though, I didn't seriously expect a complete resource on every process there is. Certainly it was a considerable undertaking as it was to assemble this volume. But considering the size of the book, and the cost, he could have been more precise about the subjects covered and sacrificed a little of that ingratiating style in the name of clarity.
All that said, I'm still glad this book exists, it is a wonderful introduction to the great world of alt printing. But be sure to check other sources before proceeding with any process.