PREFACE TO FOURTH EDITION. 



The Third Edition of Strangeways* being exhausted, it is 

 deemed advisable to issue a Fourth. 



The work has been very carefully read and considered, with 

 the result that little or no material alteration has been made. 

 The diction has occasionally been improved, and a few 

 alterations and additions made in the nomenclature where 

 such appeared necessary. 



Histology has become such a distinct branch of science, 

 that the portions touching on that subject must, in a work 

 like this, be somewhat brief and insufficient; but they have 

 been modified and allowed to remain, as they may not 

 prove altogether worthless. 



I trust that this Edition of the work will maintain the 

 reputation acquired by its immediate predecessors. 



I. VAUGHiJN. 



JilDlNBURGH 29th April, 1892. 



