Farmyard Manure. 



237 



Table showing the Composition of Experimental Heap (Xo. II.), fresh Farm- 

 yard Manure under Shed, calculated dry, at different periods of the Year. 



organic and mineral substances increases, up to the oOth of April, 

 with the time during which the heap has been kept under shed ; 

 but that this increase is not so great as in the experimental heap 

 No. I. 



4. The proportion of free ammonia, and of ammonia contained 

 in salts which are readily decomposed by quicklime, perceptibly 

 decreases on keeping of the manure. 



5. The total amount of nitrogen, on the contrary, perceptibly 

 increases in the several experimental periods. 



6. The amount of nitrogen in the soluble organic matters 

 slightly, but regularly, increases with the time during which the 

 manure is kept ; and the same remark applies to the nitrogen in 

 the insoluble organic matters. 



7. The August analysis cxhilnts a very much larger percent- 

 age of insoluble inorganic substances than the Aprd analysis, 

 and even than the analysis made on the 15th of November, 

 1855. 



It is evident that the sample taken for analysis on the 23rd of 

 August contained a ccmsiderablc amount of mechanical iiiijiuri- 

 tics, which spoil, to some extent, the general results. In a minor 

 degree this source of error will be perceived in the N()veinl)cr 

 analysis (\ovemljer 15th, 1S55). If, however, due allowance 

 be made for this evident admixture of accidental earthy matters, 



