PREFACE 



this end. By grasping every opportunity of com- 

 parison of the type selected with allied forms which 

 show differences of detail, he will then be able to 

 guide the pupil to distinguish essentials from second- 

 ary details, and to check the dangerous tendency 

 of beginners towards generalisation from too limited 

 an area of fact. 



F. O. BOWER. 



GLASGOW, April 1894. 



