of these materials, information that will give
better clues as to whether it may be opportune
or diplomatic or safe from a regulatory stand-
point to persist in using a material that may be
allergenic or sensitizing. Also, Dr. Leung has
tried to emphasize the quality of commercial
preparations, with an eye toward the purcha-
sers and end users who will ultimately find the
volume so useful.
Anyone with a sense of romance will cher-
ish the names of these materials, and anyone
with an appreciation for order and thorough
documentation will regard this book as useful
and to the point.
DONALDA. DAVIS,EDITOR
Drug and Cosmetic Industry
New Yorkxii Foreword to the first edition