[334-336 



PART IX 

 WATER ANALYSIS 



334. It is not very often that the agricultural analyst is 

 called upon to analyse water. In this chapter, therefore, only 

 that part of water analysis which is most useful is described. 

 For information on such subjects as the analysis of gases con- 

 tained in water, and the combustion method of analysing the 

 solid matters, students are referred to larger text books. 



335. In the statement of results two methods are at present 

 in vogue. Some chemists state the number of grains of each 

 substance contained in a gallon of water, considering a gallon 

 of water to weigh 70,000 grains. Others state their results in 

 parts per 100,000 of the water. In this chapter all results are 

 worked out in grains per gallon. Parts per 100,000 may be 

 calculated by dividing the grains per gallon by 7. 



ANALYSIS OF WATER FOR DRINKING PURPOSES 



336. Before proceeding to the analysis proper, notes should 

 be taken as to the colour, taste, and smell of the water. 



The colour is best seen by filling a tall narrow glass cylinder, 

 free from colour, with the water, placing it on a white tile, and 

 looking down through it. 



The taste and smell are best noted when the sample is 

 slightly warmed. 



