171-173] 



Silage 



ill 



Bunsen until only 50 c.c. are left \ this volatilises all the acetic 

 acid. About 200 c.c. of water are added, and the liquid 

 titrated as before. 



171. Calculation. — The number of c.c. used in the second 

 titration are subtracted from the number used in the first. The 

 difference gives the potash required to neutralise the volatile 

 acids. These are calculated by taking the amount of acetic 

 acid, CH 3 C0 2 H, equivalent to the potash. 



From the second equation the non-volatile acids are calcu- 

 lated as lactic acid, C 2 H 4 (OH)C0 2 H. 



172. The following are typical analyses of silage : 



Sour 



Sweet 



Water 

 Acetic acid 

 Lactic acid 

 Soluble ash 

 Insoluble ash 

 Soluble albuminoids . 

 Insoluble albuminoids . 

 Digestible fibre . 

 Woody fibre 

 *Chlorophyll, &c. 



*Containing nitrogen 

 Total nitrogen 



64-31 

 •49 

 •96 



I'5l 



i'37 



•96 



i-86 



777 

 11-46 



9-3i 



67'33 

 •07 

 •60 



I-02 



i-35 

 •60 

 i-88 

 8-66 

 8-91 

 9-58 



100 -oo 



•23 



•67 



•17 



•57 



ROOTS, SWEDES, MANGELS, TURNIPS, &c. 



173. This analysis is conducted in a somewhat peculiar 

 manner, and requires a slight preliminary explanation. 



The constituent parts of roots may be divided into the in- 

 soluble and the soluble portions ; but seeing that the water in 

 these plants amounts to between 80 and 90 per cent, it is to 

 be expected that the whole of the soluble matter will be in 

 solution. The analysis, therefore, divides itself into two parts — 



