266 § 132. FODDER AND FOOD. 



After 12 hours, pour off the dark-colored liquid, wrap 

 the solid mass in a linen bag, and, with a powerful screw- 

 press, force out the remainder of the alcohol. Pour 

 diluted alcohol over the press-cake 4 or 5 times, and each 

 time press the liquid out completely. In this way 1-2 

 litres of a highly-colored alcoholic extract are obtained. 

 Heat the liquid almost to boiling till all the alcohol is 

 volatilized, evaporate it to a small bulk, add an excess of 

 rather thick milk of lime, and boil the mixture for some 

 time ; allow the precipitate to subside, draw off the clear 

 liquid with a siphon, filter the remainder through linen, 

 and wash the residue well ; heat the solution thus ob- 

 tained, pass carbonic acid through it, boil and filter; 

 evaporate the filtrate to a small bulk, and use the whole 

 of it for the determination of nitric acid by Schlossing's 

 process (§ 62, a), in case there is reason to believe that but 

 little is present ; or a part of it may be used for this pur- 

 pose, and the remainder treated as directed above for the 

 examination of the aqueous extract. 



132. If it is desired to estimate still more in detail the 

 non-nUroge^ious substances in the fodder, boil the residue 

 that is insoluble in water (§ 131, a), first with common, 

 and then with absolute alcohol, so long as the washings 

 are colored ; then extract this second residue with ether ; 

 these extractions can be most conveniently made with the 

 aid of the washing-bottle filtering arrangement (§ 39, c). 



a. Evaporate both the extracts, or aliquot parts of 

 them, to dryness, to determine the amounts taken into 

 solution. 



h. Crude Cellulose— Treat 2-4 grms. of the residue 

 that has been exhausted with alcohol and ether above, as 

 directed in § 78. 



In case solid excrements are being analyzed to deter- 

 mine the amount of cellulose in them as compared with 

 fodder, a longer maceration is advisable, for 14-16 days, 

 instead of 12-14. 



