CHEMICAX SELECTION OF MOTHERS. 



79 



until it reaches 15 degrees C. It is then desirable to add 

 10 c. c. of a normal soda solution, in order to neutralize 

 the free acid; distilled water is added to complete the 



Slassy's Method for Taking Sample, Showing also Distribution of 

 Sugar in Superior Beets. 



! I 



FIG. 29. Diagram oi 

 FIG. 28. Sampling. Violette's theory. 



100 c. c; thorough agitation is necessary in order to 

 have the solution homogeneous. Filtration follows; 

 10 c. c. of the filtrate is emptied into a graduated 

 burette (graduation of one-tenth c. c); 10 c. c. of 

 the Violette copper solution* are accurately meas- 



*Tlils liquor consists of 36.46 grams crystallized sulphate of copper 

 dissolved in 100 c. c. of distilled water, 200 grams seifrnette salt, 90 

 grams caustic soda. This formula varies slightly. Great care is 

 required in its preparation ; it mi7st be kept in the dark, etc. ; as it is 

 very sensitive to light it is best to prepare lias needed. 



