THINGS ESSENTIAL TO BOTANICAL TEACHING 65 



tized, and good books on it become accessible. It is 

 especially important not to allow too great a number 

 of students to go together on these excursions, and 

 in my own experience not over ten can profitably 

 be taken at any one time. The collecting instinct, 

 so invaluable to the naturalist, should at such times 

 receive every possible encouragement, and later will be 

 found suggestions upon its utilization (in Chapter VI). 



Finally, it is well for the teacher to teach as far 

 as possible by example, for here, as elsewhere, it is 

 better than precept. It is an inspiration to students 

 to see their teacher himself a student always striving 

 to learn and advance. 



