APPENDIX E 



LABORATORY EXERCISES 



THE following laboratory exercises are intended to serve merely 

 as suggestions. It is impossible and inadvisable to attempt to 

 outline a rigid set of exercises for instructors to follow. It is 

 the hope that these may serve as hints or type exercises, capable 

 of all sorts of modification to suit conditions. An attempt has 

 been made to avoid elaborate laboratory equipment which is 

 expensive and unnecessary. The instructor should always aim 

 to arrange laboratory practicums so that the student's inquisi- 

 tive curiosity may be aroused and he may be induced to find 

 out things for himself from the material with which he has to 

 work. These exercises are not arranged with any particular 

 order or sequence. The sequence will depend on the time of 

 the year, material at hand, and so forth. The first group of 

 exercises is of a general nature, and the exercises on corn, 

 potatoes, and the cereals are grouped more or less together. 



We wish to acknowledge the assistance of Professor E. E. 

 Barker in the preparation of these exercises, most of which 

 have been successfully used by him with large classes. A few 

 new ones have been added. 



EXERCISE 1 



Field Study of Variations by making an Herbarium of Variations 



Have each student collect, press, and mount fifty variations 



of plants. This is an excellent exercise, because it calls the 



394 



