CONSEltVATION OF THE SUGAE BEET. 



249 



width and 1.00 ra. (3.28 feet) for its height ; the length 

 is variable. 



Fig. 54. 



Silo on a slant, preventing a deposit of water. 



The English were the first to understand the im- 

 portance of underground drainage. We will give 

 Pailly's idea. (See fig. 55.) It consisted in having 



Fig. 55. 

 Longitudinal section. 



Pailly's idea facilitating the drainage. 



the silos penetrate the soil only 0.30 m. (0.98 foot) ; 

 two ditches were dug having 0.50 m. (1.64 foot) or 

 0.20 m. (0.65 foot) in excess of the lowest portion 

 of the silos; these were filled with stones, the water 

 filtering through the lower portion would be earned 

 away by this plan of drainage. 



These silos were covered, with earth in the usual 

 manner, and had one great objection, which was that 



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