CHEMICAL SELECTION OP MOTHEES. Ill 



the help needed is considerably reduced. For 4000 to 

 5000 analyses: 



a„-_^n_„ (To operate the sampler 1 



Sampling 1 To serve the sampler 1 



! Cutting samples 1 

 To operate the apparatus 1 

 To carry juice in flasks to filtering tables * 



'■"t^ation {g^^!«"::;:;:;;;:::;:::::;;:;::;:;:;::::;::::::::J 



Polarization {I^s?^:'"^^":;:::::;:::::::: i.!::: ::::::::::: J 



Including two women to wash capsules, etc., we must estimate 

 at least 20 persons. 



In the analyses of 10,000 beets per diem, by the 

 Keil rasping method, there are needed 56 persons 

 instead of 20 for 3000. By the Hanriot machine, 30 

 individuals are necessary to do the work. It would 

 be a great mistake to take any of the figures as being 

 exact to the letter, for experience is a great factor ; the 

 climatic influence of the environment is also a question 

 not to be overlooked; and there are great doubts if 

 any mother-selecting laboratories of the United States 

 could at first reduce the number of hands to within the 

 limits given in the foregoing. 



The persons employed in the Legras laboratory, 

 being in many cases boys and girls under the charge 

 of competent persons, are more numerous than if the 

 training of the individuals had been going on during a 

 period of seasons, which would be difficult to realize; 

 the laboratory should not be in full activity moie 

 than a few months of the year. 



Apparatus Necessary for a Laboratory Capable of 



Analyzing 2500 to 3000 Mothers Per Diem 



by the Keil Rasp Method 



One rasp, i motor (gas, petroleum or hand 

 motor), I polariscope, 200 numbered capsules, 4 chem- 

 ical balances, 8 nickel capsules, 4 weights (one-fourth 

 normal weight), 4 nickel funnels, 4 water reservoirs, 

 50G flasks of 50 to 55 c. c. capacity, 500 funnels, 500 

 tumblers, 200 numbers with pinches, 2 continuous 



