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%``Contrariwise, if it was so, it might be; and if it were so, it would be; but as it isn't, it ain't. That's logic.''

%\rightline{---Tweedledee}

In the Introduction to his volume \emph{Symbolic Logic}, Charles Lutwidge Dodson advised: ``When you come to any passage you don't understand, \emph{read it again}: if you \emph{still} don't understand it, \emph{read it again}: if you fail, even after \emph{three} readings, very likely your brain is getting a little tired. In that case, put the book away, and take to other occupations, and next day, when you come to it fresh, you will very likely find that it is \emph{quite} easy.''

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The same might be said for this volume, although the reader is forgiven if they take a break for snacks after \emph{two} readings.
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%This book is dedicated to the logical connective \emph{tonk}.
%[A] man who perfectly understood a just syllogism, without believing that the conclusion follows from the premises, would be a greater monster than a man born without hands or feet.
%---Thomas Reid %EIP 6.5 p. 632
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%\parbox{2.5 in}{This book is motivated by the thought textbooks cost too much, especially for 

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{\sf about the author:}
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P.D. Magnus is an assistant professor of philosophy in Albany, New York. His primary research is in the philosophy of science, concerned especially with the underdetermination of theory by data.
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