PREFACE 



THIS Laboratory Manual is designed to accompany my 

 General Science. The experiments contained in the man- 

 ual, with the exception of those on Specific Heat, Heats of 

 Fusion and Vaporization, and a few others, can be easily 

 and intelligently made by the average pupil of the second 

 year high school, since little or no mathematics is involved. 



The elaborate and quantitative experiments required 

 for college preparation have been entirely omitted. Only 

 such experiments are given as will prove of interest and 

 benefit to the pupils whose formal education ends with the 

 high school. 



It is my experience that five periods per week for one 

 year will suffice to cover the ground indicated in General 

 Science and most of the ground indicated in the Laboratory 

 Manual. If there is not time to make all the experiments, 

 Experiments 8 and 14 and others of similar detail may be 

 omitted. 



It is hoped that the heterogeneous nature of the experi- 

 ments will offer something of interest and help to every 

 pupil, and, in addition, will induce some few to take up 

 a study of theoretical science, whether in pbysics or 

 chemistry. 



The metric and English systems of measurement are 

 used indiscriminately according to convenience. The stu- 

 dent should keep in mind that one cubic centimeter of 

 water weighs one gram ; and that an ordinary test tube 



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