CONSERVATION OF FEEDING-STUFFS 135 



nitrogen-free extract, whilst mangels which con- 

 tained less water lost only 5-8% dry matter and 

 5-7% nitrogen-free extract. A very considerable 

 part of the cane sugar in mangels is converted, on 

 storage of the roots, into grape and fruit sugars. 

 All these circumstances are strongly influenced by 

 the temperature of the storage place, and in the 

 same sense as was the case with the potatoes men- 

 tioned above. Protection from frost, from tem- 

 perature above 50-54 F., from moisture, sufficient 

 mechanical ventilation under certain circumstances, 

 removal of diseased tubers, as well as the excess 

 of earth before clamping, are points to be remem- 

 bered in storing roots, either in clamps or in cellars. 



(5) The artificial drying of feeding-stuffs. 



Beet slices, brewers' grains, distillery waste, etc., 

 which are difficult to preserve in their original 

 state are often dried artificially. For this purpose 

 many different forms of apparatus have been 

 designed to effect a rapid desiccation, and the success 

 which they have achieved has led to other materials 

 — potatoes, turnip tops, and even skim milk — being 

 so treated. In many cases, as with sliced beets, 

 sometimes also with brewers' grains and dis- 

 tillery waste, the greater part of the water is first 

 got rid of by pressure or centrifugal force. After 

 this steam or furnace gases are used to thoroughly 

 dry the material. 



