108 SUGAR BEET SEED. 



solution in reservoir L. This mixture is prepared by 

 adding to looo c. c. of water, 29 c. c. of subacetate at 

 30° Be., followed by careful agitation; under these cir- 

 cumstances the cock, K, is turned a half-revolution for 

 each filling of the pipette. One of the objections to this 

 mixing in advance is that as considerable volume must 

 be prepared, and if not done under the direct care of 

 the chemist, there would be no certainty as to results, 

 while by the mode described in the foregoing, the pro- 

 portions would be accurate for each experiment; 

 hence, the desirability of having a separate subacetate 

 flask. We take pleasure in calling attention to the fact 

 that this apparatus is also constructed for the Laurent 

 polariscope, in which case the pipette has a capacity 

 of 171.4 c. c, and double the normal weight (16.29 

 grams), or 32.58 grams is weighed in the capsule. The 

 simplicity of the analysis places it within reach 

 of the rural population, who, without any special tech- 

 nical education, could soon learn to use the polariscope 

 and estimate for themselves just what percentage of 

 sugar their beets contain. 



General Remarks on Laboratory Requisites for the 

 Selection of Mothers by the Cold-Water Method. 



A general idea of a selecting laboratory was shown 

 in a plan on page 95. The arrangement, however, 

 varies very much with the facihties one has at his dis- 

 posal; however, there are certain essentials from which 

 no great departure must ever be made. 



Under all circumstances, there should be plenty of 

 room around a central table containing 100 samples of 

 juice being filtered. The going and coming being 

 very considerable, the distribution of light is 

 important, not only during the day, but at night. For 

 it frequently happens in laboratories visited by the 

 writer, that the capacity is doubled by working night 

 and day, under which circumstances, it is possible, 



