PREFACE. 
Var Address or Lecture following the Report of the Curators, is 
published at the request of the Natural History Society. In the de- 
livery it was illustrated by magnified drawings, and some experiments, 
which, of course, must have made it more plainly understood than it 
can be by a simply printed statement. 
JAMES L. DRUMMOND, M.D. 
PRESIDENT, B.N.H.S. 
§2> The directions for preserving objects of Natural History have been fur- 
nished by the Council of the Natural History Society, and published at their 
request. 
