EXPERIMENT STATION BULLETINS. 



239 



of the leaves does not increase materially during the last six weeks of the growing 

 season, but during this time the weight of the root increases by 64% of its weight 

 at the beginning of the period, or 39% of the weight of the matured beet." 



In 1898, Cooke* found from samples of eight varieties tested October 1, average per 

 cent of sugar to be L5.85, with purity 80.3. The same varieties tested three weeks 

 later gave 16.22% sugar, with purity 77.5, — a gain of .37 in sugar, but a loss of 2.8 in 

 purity. In four tests made October 8, compared with beets from the same source on 

 October 29, gave a loss of .13% sugar content and gain of .07 in purity for the later 

 sampling. 



Out of over 500 samples of beets analyzed by the chemist of this Experiment Station, 

 taking the average of ten out of each consecutiv^e fifty, we get the following results: 



1-10 



51-60.... 

 101-110., 

 151-100., 

 201-210. 



251-260. 

 301-310., 

 351-360. 

 401-410. 

 451-460. 



Average . 



Laboratory numbers. 



Per cent 

 sugar. 



I 



15.24 

 15.38 

 14.29 

 14.90 

 14.08 



13.31 

 14.05 

 14.22 

 15.55 

 15.12 



Purity. 



14.62 



81.82 



81.48 



78.92 



81. 



83.23 



77.57 

 79.. 55 

 80.76 

 79.11 

 82.36 



Average. 



Per cent 

 sugar. 



)' 14.78 



V 14.45 



80.58 



Purity. 



81.29 



79.87 



The above figures show the results from consecutive analyses and are in no way 

 definite. They would, however, indicate approximately what the results would be as 

 beets are delivered at factories, showing a slight decrease as the season progressed, 

 both in percentage of sugar and co-efficient of purity. 



The first samples, numbers one to ten, were analyzed about October 15. The work 

 of analyzing the following samples progressed continuously until December 1, when the 

 last samples, numbers 451 to 460, were completed. 



* Colorado Experiment Station Bulletin No. 51. 



