2/2 THE PLANT WORLD. 



founders of this aspect of plant biology, Christian Konrad Spren- 

 gel and Hermann Mueller, is a rich treasure to the student, pro- 

 fessional and amateur alike, and should give a new impulse to the 

 study of the subject with which it treats and, what is still more 

 to be valued, should direct the student into a far more critical 

 attitude than is, regretfully, usually characteristic of the average 

 observer of the interactions of flowers and insects. The chapter 

 on methods of research is, therefore, especially welcome in such 

 a volume, because it not only shows how it is to be done, but, 

 that it may be done, and that with little special technique and 

 training. It is a field in which, with this book for reference, 

 the earnest amateur may find himself at home. The introduc- 

 tion, which follows an historical review of the subject, is an 

 analysis of the facts at present understood, both from the bo- 

 tanical and zoological point of view. A most stupendous bib- 

 liography occupies i6i pages, and it must be confessed that the 

 relevancy of the works cited is not equally obvious. " Better," 

 however, "the excess than the defect." 



L. 



