viii INTRODUCTION 
small compass a large amount of most useful information, and has 
presented it in such an attractive manner as to make it interesting 
in itself and sure to create enthusiasm that will lead to further 
study. He has described in an elementary work the most recent 
findings of science — such as we usually expect to read about 
only in more advanced texts. 
While not pretending to be exhaustive, the work has in a high 
degree the quality of accuracy; and the manner in which it seeks 
to arouse inquiry and develop originality on the part of the student 
should recommend it to those who are seeking to create an interest 
in nature study and relate it to the important business of 
agriculture. 
C. B. WaLpron. 
Dean of Agriculture, North Dakota 
Agricultural College. 
Farco, NortH Dakota 
