CLARK'S 

 GENERAL SCIENCE 



By BERTHA M. CLARK, Ph.D., Head of Science 

 Department, William Penn High School for Girls, Phila- 

 delphia, Pa. 



$0.80 



Laboratory Manual, to accompany the textbook 



THIS course in general science, which was successfully 

 developed by the author for use in her classes, is suit- 

 able for pupils in the high school course who do not 

 go to college. While it deals with physics, chemistry and 

 hygiene, the controlling idea has been to make the presenta- 

 tion as informal and untechnical as possible, to arouse the in- 

 terest of the student, and to provide information which will 

 broaden his horizon and be of real practical value. Each topic 

 describes some interesting phenomenon commonly met in every- 

 day life, and afterwards discusses in a popular style the scientific 

 principles on which it is based. The meeting wisely of some 

 of life's important problems, the conservation of energy, and 

 the comprehension of many important inventions receive atten- 

 tion, yet throughout due regard is paid to mental training. 

 ^[ Practical laboratory work in connection with the study of 

 this book is provided in the Laboratory Manual, in which 

 eighty-nine experiments are presented, which are designed to 

 make the pupil familiar with some of the facts and theories 

 discussed in the author's textbook on general science. The 

 experiments, which are accompanied by full directions, can 

 easily be performed with simple apparatus. Among the sub- 

 jects treated are temperature, ventilation, composition and purity 

 of foods, purification of water, lenses and photographic paper, 

 tests for eyesight and hearing, some principles of machines, 

 soap making, baking soda, bleaching powders, dyeing, artifi- 

 cial coloring and preservatives in foods, sound, electricity, etc. 



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