Preface V 



not lessen the value of the material for 

 chemical instruction but rather enhances 

 it. 



The work was designd for students in an 

 agricultural college who have already had 

 such a knowledge of chemistry as is acquired 

 from a year's work in the high school. It is 

 intended to be done in two or three hour 

 laboratory periods, and furnishes sufficient 

 material for one semester of such exercises. 

 The arrangement of the work is such that a 

 laboratory full of students can all be doing 

 the same thing at the same time without 

 extended waiting; procedures, such as crys- 

 tallization and cooling, taking place in the 

 interim between exercises. With us it is 

 customary to score the preparation when 

 completed, as one would butter or milk, 

 allowing something for quality and some- 

 thing for quantity and to give credit for the 

 exercise only upon completion of the prepara- 

 tion. 



The author is endeted to Professor A. A. 

 Blanchard of the Massachusetts Institute of 

 Technology not only for the development of 

 synthetic method of laboratory work for first 

 year work in college, but also for the privilege 

 to adapt three preparations from his book, 

 Synthetic Inorganic Chemistry, for use in 

 this manual. The three preparations are 



