lv PREFACE 
illustrations. It will be noticed that the attractive but often 
indefinite half-tone style of illustration has been sparingly 
employed and for the sake of giving broad effects only, not 
for details. 
The acknowledgments made in the respective prefaces to the 
original edition of the Elements of Botany and to the Founda- 
tions of Botany, concerning sources from which illustrations 
have been derived, need not here be repeated. Neither is it 
necessary to recapitulate the names of those whose aid and 
counsel gave to the books above mentioned much of whatever 
value they may have been found to possess. 
In the present impression the author has made a good many 
minor alterations at the suggestion of teachers who have used 
the book or professional botanists who have been kind enough 
to read and criticise it. Chapter XV has been wholly, and 
Chapter XVI partially, rewritten. 
Campripce, Jury, 1906. J. Y. B. 
