White Willow

Sketching a white willow in the old Middlesex Filter Beds on Walthamstow Marsh, now a nature reserve.  Wonderful place and beautiful weather.  White willow provides salicin, the active chemical ingredient in today's most common painkiller, Aspirin. The Greek Scholar and father of medicine Hippocrates advised chewing bark to alleviate the pain of childbirth over 2000 years ago.