ADVERTISEMENT. 
In laying its Memoirs before the Public, this Society 
does not hold itself as responsible for the facts or opinions 
which may be advanced on the various topics of Natural 
History that are discussed. These, accordingly, must be 
distinctly understood as resting entirely on the individual 
authority of the respective Writers who have favoured the 
Society with Communications. 
The Council of the Wernerian Natural History 
Society, in order to meet the wishes of Authors of Com- 
munications^ whose views and discoveries may he antici- 
pated by delay in the publication of the Memoirs^ have re- 
solved that, in future, the Parts shall be published half- 
yearly, and that they shall he limited to the size and price 
of the present volume. 
May 1823. 
