Author's note in 2021: This 'Book' was assembled sometime between 2012 and 2014. I haven't edited it since then except for very minor things. I haven't needed to change much as the original information is still accurate 20 years after the collapses.
A 20 year review of this information is available elsewhere in this website.
"The supreme goal of all theory is to make the irreducible basic elements as simple and as few as possible without having to surrender the adequate representation of a single datum of experience."1
"A theory is to make you understand what is going on, to make it (the process under study) intelligible."2
"The work presumes a standard of education corresponding to that of a university matriculation examination, and, despite the shortness of the book, a fair amount of patience and force of will on the part of the reader. The author has spared himself no pains in the endeavour to present the main ideas in the simplest and most intelligible form, and on the whole, in the sequence and connection in which they actually originated. In the interest of clearness, it appeared to me inevitable that I should repeat myself frequently, without paying the slightest attention to the elegance of the presentation. I adhered scrupulously to the precept of that brilliant theoretical physicist L. Boltzmann, according to whom matters of elegance ought to be left to the tailor and the cobbler. I make no pretence of having withheld from the reader difficulties which are inherent in the subject. On the other hand, I have purposely treated the empirical foundations of the theory in a "step-motherly" fashion, so that readers unfamiliar with physics may not feel like the wanderer who was unable to see the forest through the trees. May the book bring some one a few happy hours of suggestive thought!"3