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work. The latter are incorporated as an integral part of the text 

 development, not as sometimes happens, as disjunct digressive 

 passages. Part of the distinctiveness of this book lies in the fact 

 that most of its generalizations are "developmentally" approached ; 

 the expositional style is purely inductive as compared with the 

 more didactic treatment followed by most American texts. The 

 Priestley and Scott presents considerable objective data in the 

 form of measurements, and tables, but much less in the way of 

 pictures than the average American book. The illustrations given 

 are chiefly original, skillfully made drawings, often showing three- 

 dimensional aspects. 



One illustration of the quality of the Priestley and Scott is 

 found in the treatment of the common plants upon which the 

 morphological and physiological discussions are based. It must 

 have been the not infrequent experience of all teachers in biological 

 sciences to be confronted with factual questions relating to even 

 the most widely discussed species for which no definitive answer 

 was readily if at all available. The writers of this text have 

 evidently anticipated this difficulty by carrying on a good deal of 

 original research regarding the plants discussed in the text. 



