In comparative syntax a general approach has been pursued over the past decade predicated on the notion that Universal Grammar allows of open parameters, and that part of the job of linguistic theory is to specify what values these parameters may have, and how they may be set, given primary linguistic data, to determine the grammars of particu- lar languages. The papers presented in this volume are also concerned with language variation understood in this way. Their goals, however, do not strictly fall under the rubric of comparative syntax, but form part of what is more properly thought of...

Venous valves rank among the smallest and most delicate organs of the human and animal bodies - so why devote an entire book to them? We were induced to do so by several reasons. First of all we would point out the clinical significance of venous valves. In the pathogenesis of a number of widespread diseases, such as varicose veins or the post-thrombotic syndrome, venous valves are involved as the underlying cause or at least a factor contributory to the symptoms. According to Taheri et al. these venous diseases occur ten times more frequently than arterial obliterations. Incompetence of...

DDDDDDDDDDDD Effective management logically follows accurate diagnosis. Such logic often is difficult to apply in practice. Absolute diagnostic accuracy may not be possible, particularly in the field of primary care, when management has to be on analysis of symptoms and on knowledge of the individual patient and family. This series follows that on Problems in Practice which was con cerned more with diagnosis in the widest sense and this series deals more definitively with general care and specific treatment of symp toms and diseases. Good management must include knowledge of the nature,...