iv Kl.KMKNTS (>K (iKNKKAL 



critics of the experiment. The success of the course has been 

 such as to justify its presentation, with the hope that it may 

 prove helpful in increasing the efficiency of science teaching. 



The unity which is essential to any worthy study of science 

 is here secured by means of the logical connections between 

 the topics which compose the course, no attempt being made 

 to maintain the unity of any one of the different sciences 1'rmn 

 which materials are taken. These topics are readily arranged 

 under five major headings. Within these major topics the sub- 

 topics, which are further divided into sections, are arranged 

 so that there is constant coherence, thus giving progression in 

 the nature of the work. 



The difficulties which arise in the selection of material for 

 a general science course are largely those of elimination. 

 Even after the exclusion of all materials which are obviously 

 unsuited for elementary presentation, the richness of the field 

 is embarrassing. At the same time any such selection must be 

 definite and limited if it is to be useful. The authors have 

 made choice of the materials here indicated upon grounds of 

 pedagogical value and after extended classroom use. 



The topics considered are those of general significance. 

 Apparatus suggested for use in experiments should be the 

 most simple available. Apparatus from the community and 

 home may often be more educative than that which is complex 

 and costly. In general, each pupil should work out his own 

 experimental problems, but in many cases a single demonstra- 

 tion to all the class by the teacher or by a small group of 

 pupils is preferable to individual experiments. 



The authors wish particularly to express their appreciation 

 for the advice and criticism given in various ways by Director 

 Charles H. Judd, Principal F. W. Johnson, Dr. Mary Blount, 

 Mr. George J. Miller, Dr. E. S. Bishop, Mr. C. J. Pieper, and 

 Professors C. R. Mann and R. A. Millikan. 



OTIS. W. CALUWELL 



w. L. EIKENBERRY 



