AN EXPERIMENTAL COURSE 

 OF CHEMISTRY 



FOR AGRICULTURAL STUDENTS 



PART I 



1. WEIGHTS AND MEASURES 



In this course a knowledge of chemistry is to be sought by an 

 experimental study of the composition and properties of those 

 substances with which agriculture is concerned. In doing this 

 it will be necessary to determine the quantity of substances both 

 by weight and volume. In science a decimal system of weights 

 and measures is employed. The standard of weight is the 

 gram \ the parts of the gram are the decigram, centigram, and 

 milligram; the multiples are the dekagram, hectogram, and 

 kilogram. By means of a chemical balance determine how 

 many decigram and centigram weights make a gram and how 

 many grams there are in a dekagram and hectogram. 



In using a chemical balance observe the following rules : — Place the 

 thing to be weighed in the left hand pan, the weights in the right. Never 

 touch the weights with the fingers, but with the nippers only. Never place 

 anything upon or remove anything from the pan while it is swinging. When 

 reckoning up the weights do so while they are on the pan, then enter the 

 amount in the notebook and check it by again counting the weights while 

 returning them to the box. 



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