ELEMENTS OF COMPAEATIVE ZOOLOGY, 



INTKODUCTION. 



Every true teacher must have his own methods, but 

 some suggestions as to the way in which this book is 

 intended to be used may be of value. In the first place, 

 the laboratory work is regarded as most important, since 

 through it the student is trained in observation a train- 

 ing utterly lacking in all the non-scientific studies of the 

 school curriculum; and also since by it he acquires an 

 autoptic knowledge of the animals studied. It is be- 

 lieved that every point mentioned in the laboratory direc- 

 tions can be made out by students in the high-school 



Each student should make all the drawings called for.* 

 Drawing the object seen is one of the greatest aids to 

 observation, and every pupil, no matter how lacking in 

 artistic ability, can make intelligent sketches of all points 

 called for. These sketches have great value for the 

 teacher, since by their aid one can see at a glance any 

 errors or difficulties. All questions- asked should be an- 

 swered in the note-book. 



At various points are questions grouped under the head- 

 ing " Comparisons." These questions are based upon the 



* The expression " X 2," " X 6," etc., means magnified two times, 

 six times, etc, 



1 



