10 FIRST YEAR COURSE IN GENERAL SCIENCE 



the principles of that chapter are involved but those of 

 earlier chapters also. 



The diagrams and illustrations are provided with the 

 expectation that they will make clearer the teaching of the 

 text and that original work will be done by the pupils in 

 answering the questions which accompany them. This may 

 be assigned as written work to be brought to the class and 

 there used in various ways by the teacher. 



If it is not possible to take a whole year for the course, it 

 is advised that the work be done thoroughly as far as time 

 allows and then dropped. 



The references to laboratory work indicate the points at 

 which the author thinks it best to have the exercises per- 

 formed. If for any reason it is not possible to have all the 

 students do all the work, there are three ways of using labo- 

 ratory exercises to advantage. (1) Have one or two pupils 

 do the work, while the others make notes of observations 

 reported to them; then have the class work out the results 

 from the data. (2) Let the teacher do the work, instead of 

 the pupils, and then proceed as in the first case. (3) The 

 teacher may discuss with the class the directions in the 

 Laboratory Manual, give some supposed observations, and 

 have the pupils finish as before. This last and least desirable 

 method requires no special apparatus for this course but 

 presupposes that the teacher has a laboratory knowledge of 

 the subject. Some of the exercises are to be performed out 

 of class with material which every pupil can obtain for 

 himself. 



A laboratory exercise in science may be, as in history or 

 literature, the study of a subject from other sources than the 

 textbook. A rich field for this work is provided in various 

 government bulletins of the Departments of Agriculture 

 and of the Interior. Lists of these bulletins may be obtained 

 from the departments at Washington on request, and 

 copies of such as are wanted will be furnished to a school 



