CHEJIICAL SEI.ECTIOX OF MUTHERS. 113 



tliat the flasks should ha\-e the capacity mentii->ned 

 in the description of the cold-water method of analysis. 

 The Hanriot apparatus, as described and illus- 

 trated elsewhere in this writing, is a very unique 

 design, and it should be obtained from the maker. 

 The .same may be said of the Keil and Dolle rasp and 

 the continuous tube for polariscopes. In Germany, 

 many modifications have been made, but to the writer's 

 knowledge none have given the satisfaction of the 

 original Pellet combination. 



German Selecting Laboratory. 



By wa}- of comparison with the Legras laboratory, 

 just described, one may take the Braune (Biendon, 

 Germany), laboratory, which, up to 1889, worked as 

 we shall describe herewith, but has since introduced 

 the cold-water method. However, there are certain 

 conditions which have not changed. The beets 

 are analyzed in February, and by the end of 

 April the work is finished; the physical selection 

 having been carefully done the year previous. The 

 beets at the time of harvesting are selected by the 16 

 degrees Brix salt-water selection; all beets sinking and 

 weighing at least 500 grams are subsequently polar- 

 ized, as it is supposed that they contain at least 

 16 per cent, sugar. The work is done by men of 

 long experience. 



The February laborator}' work is better explained 

 by following the engraving herewith (Fig. 42). The 

 rasp used gives a fine pulp. This is submitted to a 

 pressure in the powerful press (r); two-thirds of the 

 resulting juice is used for polarization, the remaining 

 third being used later. Four c. c. juice (2) is poured 

 into a flask of 10 c. c. capacity; then the flask is filled up 

 to the mark with diluted subacetate of lead. Filtration 

 follows; the 100 m. m. tubes of the polariscope (3) are 

 filled with the filtrate. All beets polarizing more than 



8 



