When this book was first published it contained a large amount of material which is now taken out of it; additions have been made, besides many corrections and changes; and the whole form of the book has been remodelled. It is now more what it ought to have been from the first; what I saw, from the moment of its publication, that it ought to have been: a book of theory. The rather formal announcement of my intentions which I made in my preface is reprinted here, because, at all events, the programme was carried out. This book, I said then, is intended to form part of a series, on which I have been engaged for many years. I am gradually working my way towards the concrete expression of a the…
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