CHEMICAL SELECTION OF MOTHEES. 



103 



The arrangement is shown lierewitli : Fii-st donble column, with 

 number of observation and polarization; the second, etc., series 

 follow: as each sheet contains 100 ob.servaiioiis for 10,Ono polarizations 

 per diem, 100 sheets would be required; these are separate and 

 complete. 



From these tables is combined another, giving a 

 synopsis for the loo analyses made, and the number of 

 mothers having a special polarization, and the num- 

 ber rejected: 



If 10,000 polarizations are made, 100 sheets like this are necessary. 

 One sheet being continuous of the other, the final sheet would give 

 the exact condition of the day's work. 



It must not be forgotten that the Legras mother- 

 selecting laboratory is the most important in France, 

 if not in the world. With proper assistants, 10,000 

 analyses may be made in twenty-four hours. By the 

 present arrangement, however, 34 persons are employed : 

 To carry beets, 2; sampling, 2; filling trays with sam- 



