xii FOREWORD
while to repeat what is otherwise available seems pointless. At
the risk of confusing the reader I have been obliged to adopt the
compromise of explaining some matters over again and of giving
only references for others. Still, although this study is really the
concluding section of a larger work, it is my hope that what fol
lows will be intelligible by itself.
E. R. G.
New Haven, Connecticut,
i April 1938.