INTRODUCTION 



EvBET student should have assigned him a definite place 

 to work, for whose good order he should be held responsible; 

 also a drawer in which to keep his instruments, note-books, 

 etc. The drawer ought to be provided with a lock to which 

 no one but the student and the instructor has the key. The 

 most convenient place for the drawer is in the table at which 

 the student sits, as here it is more easily accessible than 

 elsewhere. If necessary, a case of drawers may be placed 

 at some convenient place in the room. 



The laboratory exercises should be at least two consecu- 

 tive hours in length, as so much time is consumed in mak- 

 ing the preparations for work and in " cleaning up " after- 

 wards that but little can be accomplished in one hour, while 

 an exercise which lasts three hours is very likely to fatigue 

 the beginning student unduly. 



A certain fee ought to be charged for the use of micro- 

 scopes and other apparatus, and for specimens, etc. Some 

 wear and tear of instruments is to be expected, but any 

 damage beyond this should be made good by the student. 



Economy of material must be practised, but not to such 

 an extent as to interfere with obtaining a clear idea of the 

 structure of each organism. Each student should provide 

 his own specimens of the commoner forms, e. g., earthworm, 

 locust, and various plants. Before putting specimens into 

 hardening reagents, be sure to see that the body and its ap- 

 pendages are properly arranged, otherwise they may stiffen 

 in positions awkward for handling. Preserved specimens 



