NOTE TO TEACHERS 



THE practical work outlined in this book has been divided 

 into four kinds : laboratory exercises, demonstrations, field 

 exercises, and projects. The demonstrations are to be 

 done before the class either by the instructor or by some 

 pupil. It is intended that the laboratory exercises shall 

 be performed by each pupil. The extent to which each 

 pupil can do the laboratory exercises will depend on the 

 equipment and the facilities available for individual work. 

 If equipment is lacking, the laboratory exercises may be 

 performed as demonstrations. The field exercises are to 

 be done by the instructor and class outside of the school- 

 room. In the projects something is provided for each pupil 

 to do individually outside of the laboratory. These proj- 

 ects have been divided into three groups : for the home, 

 for the school, and for the community. They provide a 

 vital kind of work because they connect the school work with 

 actual life and provide opportunity for the pupil to do some- 

 thing on his own responsibility. It is suggested that a cer- 

 tain number of home projects be required of each pupil, 

 who may be allowed to choose the ones he wishes to carry 

 on. The pupils should be expected to present definite written 

 reports of the projects and should be given school credit 

 for the work done. A sufficient variety of projects has been 

 given so that each pupil can find some suited to his cir- 

 cumstances. 



The author believes that the pupils should make some 

 written records of all the practical exercises. These records, 

 kept in a notebook, should be brief and simple in form. It 

 is suggested that each record may contain, first, a statement 



