PREFACE. 
IX 
character of each petrifaction that has been 
heretofore noticed by authors, are for the pre- 
sent omitted. — It is my intention, if Providence 
allot me life and health, to publish another 
volume of “ Figures, ” &c. ; and to give, at the 
end of it, in one general view, a systematic 
arrangement of all the species I shall then 
have described ; with their synonyms^ references 
to figures, and such additional remarks on 
each, as further research may enable me to 
make. In the mean time, any information on 
these subjects, particularly from Gentlemen 
who have collected the petrifactions of Derby- 
shire, will be most thankfully received and 
acknowledged. 
MACCLESFIELD, JUNE 1 st, I8O9. 
