IV PREFACE. 



a paper or journal was published in 1874 or earlier. When 

 this occurred it was thought better to give the authors the 

 benefit of the doubt ; and therefore a few papers of 1873 may 

 have been included, as well perhaps as some of 1875. 



In some cases we have given the title only of a memoir, 

 either from not being able to see the original, or from its 

 having come to hand too late for further notice, even in the 

 lengthy " Addenda.^' It is hoped that in future, when the 

 ' Geological Record ' is better known, it may have more aid 

 from Scientific Societies sending their publications. 



The delay in publication has been owing to various causes, 

 but chiefly to the great extension of the book. However, as 

 Subscribers get over 100 pages more than was promised, and 

 at no additional cost, they can hardly complain. 



In conclusion, I would thank the printers for the way in 

 which they have done their work, ^it perpetuum. 



WILLIAM WHITAKER. 

 London, December 1875. 



