vill PREFACE. 
microscopic manipulation; and as it is intended 
to assist the beginner as well as the advanced 
student, the very rudiments of the art have not 
been omitted. 
As there is a diversity of opinion as to the best 
mode of proceeding in certain cases, numerous 
quotations have been made. Wherever this has 
been done, the Author believes that he has acknow- 
ledged the source from which he has taken the 
information ; and he here tenders his sincere 
thanks to those friends who have so freely allowed 
him to make use of their works. Should, however, 
any one find his own process in these pages 
unacknowledged, the Author can only plead over- 
sight, and his regret that such should have been 
the case. 
W ARRINGTON. 
