148 THE SUGAR BEET. 



duets of the sugar factory (molasses, defecation, animal 

 black, etc.) are returned to the soil, the possibility of ex- 

 haustion is no longer to be dreaded, but here evidently 

 exists an error, as during the manufacture ammoniacal 

 gases are easily detected. These represent a certain 

 amount of nitrogen that makes its escape, and conse- 

 quently cannot be returned. For that reason it is de- 

 sirable to have the roots and leaves analyzed, and the 

 waste products as well ; substract the one from the 

 other, and whatever the diffei'ence is add as an addi- 

 tional fertilizer to the above, and we will then return 

 al 1 that has been taken away. This would necessitate 

 the manufacturer to be a farmer, otherwise he would 

 not consider the result compensating for the loss of 

 time. 



Then, again, it has been proposed to take the cindeis 

 as a basis, but here again errors would occur, as during 

 the reduction of these many changes have taken place, 

 any one of which would lead to an error. 



Some soils have a most remarkable fertility, and 

 even after several years the results will be excellent 

 without manure,^ but then again there is a certainty 



' Mr. Pagnoul made some experiments of this sort, and the results he ob- 

 tained were the following : — 



With manure. Without mnnure. 

 Yield to the hectare (2| acres) . . 51.200 k. 26.000 k. 



Sugar, per cent 14.93 16.67 



Carbonates (alkaline) .... 0.393 0.283 



Chlorides 0.045 0.007 



