PUEFACE. Vll 



elude such Geological treatises as contained any information 

 on the structure or distribution of organic remains. But this 

 definition embraced, in fact, nearly every existing geological 

 work, and the labour of examining all such writings to ascer- 

 tain whether they did or did not contain palaeontological 

 matter would have been so great, that it was thought better 

 to extend the limits a little wider so as to include all works 

 on descriptive Geology, whether they referred to organic or 

 to inorganic phaenomena. 



The first portion of the work contains a list, arranged geo- 

 graphically, of all the known periodical or miscellaneous pub- 

 lications which contain treatises on Zoology or Geology. As 

 however it was in many cases impossible to make a personal 

 examination of all such works, on account of their extreme 

 rarity and limited circulation, it is probable that some of 

 them may not in fact contain matter relevant to our purpose. 

 This seems to be especially the case with the periodicals of 

 France and Italy, enumerated hereafter, many of which ap- 

 pear from their titles to be either of a popular nature, or to be 

 remotely connected with our subject-matter. We have how- 

 ever preferred to err on the side of excess rather than of de- 

 fect, especially as it may interest the student in other branches 

 of science, to find here recorded the titles of many valuable 

 periodicals whose existence was previously unknown to him. 

 Nor must it be supposed that some Journals, whose titles 

 have no apparent reference to Zoology or Geology, are here 

 inserted without good reason. Many a valuable fact relating 

 to those subjects lies buried in periodicals specially devoted 

 to Chemistry, Meteorology and other physical sciences, and 

 in the majority of instances the compilers have themselves 

 ascertained such to be the case before they ventured to insert 

 a title into their list. 



Under Periodical Works are included all serial publica- 



