OF PAHMYABD MANURE. 103 



phuric acid, or a few poumis of plaster, may be occa' 



sionally thrown in. The sulphuric acid will unite 



with the ammonia, ami tonn sulphate of ammonia, 



which will remain unchanged, not being liable to 



ate. Others prefer to mix sufficient peat, ashes, 



, or fine charcoal, with the liquid in the tank, 



'f-m still pump it out and pour it 



One point is to be noticed in 



the miti ot a tank. Only the water which 



natural!} ._ Irom the stables and yards should be 



allowed to enter it: all that falls from the eaves of 

 the building should be discharged elsewhere. Regu* 

 lated in titis way, the tank will seldom overflow, and 

 the roaii "• <-ted in it will be of the moet valua* 



ble and , . description. The tank may be made 



of stone, brick, or wood, as is most convenient, and 

 B^ed cost but very little. 



\ While the liquid manure is actually in many cases 

 •imost entirely lost, the solid part is often allowed to 

 drain and bleach, until nearly every thing soluble has 

 washed away; or is exposed in iieaps to ferment, with- 

 out anT cnverin?. In such a case amaooia b always 

 dmsfl F: it may often be per' y 



|hssBt-> . in horse manure. Th< ty 



ako be shown, i i<; a feather in muriatic acid 



and waving it « . ... heap. If ammonia in any 

 quantity is escapint;, white fumes will be visible about 

 tile feather, causeil by the fonaation of muriate of 

 aaunonia. A teacher can onmpHfy this by holding 

 a feather, dip{>ed in the same way, over an ammonia 

 bottle. This escape of so valuable a substance may be 

 in a (^rcat nu-asura prevealed by shovelling earth over 

 tlu! surface of the Bcap, to a depth of two or three 

 inches. If thi.s docs not arrest it entirely, sprinkle a 

 few handfuls of plaster upon the top: the sulphuric 

 acid of the plaster will as before unite with the am- 

 OMMiia, and form !«ulphate of 



