GENERAL INTRODUCTION 19 



objects studied, good pictures are inferior only to actual 

 observation. They should never be used instead of the 

 object, however, when the latter can possibly be obtained. 

 Pictures are now so abundant and accurate that they 

 at once extend the boundaries of nature study in all direc- 

 tions almost without limit. Newspapers, magazines, rail- 

 road folders, catalogues, calendars, and many other forms 



A SCHOOL CABINET 



of advertising matter are teeming with the best of pictures 

 and may be had for the asking. Interest the students in 

 collecting pictures and in a short time an abundant and 

 ever-increasing supply will be on hand. These should be 

 carefully grouped, mounted, and labeled, and placed where 

 any desired group or series may be found instantly. A 

 series mounted on a large cardboard will form a useful 



