Any object as juicy and colorful as a black walnut hull may well become
a subject for search in recovery of by-products. The thermally active
carbon made from the shells has actuated laboratory thermostats for me
for several years.
But more real and immediate by-products have been the personal
associations which have arisen from this hobby. Physicians, engineers,
teachers, farmers, persons from every calling are among those whom I
have met through a common interest in nut tree propagation. I can
recommend this hobby to anyone mature enough to take an interest in the
future, and to chemists in particular.