AGRICULTURE WITH CHEMISTRY. 



97 



The importance of making or obtaining the greatest 

 -quantity of manure with the materials now generally 

 known, and capable of being procured, is, in this prac- 

 tical Dissertation, made to precede the preparation of all 

 other manures or composts of a more expensive nature. 

 Prudence and (Economy point out, that what is easiest 

 and cheapest to be done, should always be first done ; and 

 that recourse should not be had to other means, until 

 that source of supply is exhausted, 



r '.' * 



In the former part of this Treatise, under the head of 

 Oxygenation, a short remark was made, that stable dung, 

 by long keeping, lost its more fertilizing saline parts, and 

 became oxygenated, and insoluble. A heap of such dung, 

 kept for some years, has been known to become inodo- 

 rous, insoluble, and in all respects similar to, and was a 

 true peat; hence the practical inference^ that dung 

 should only be kept a certain time. 



When animal dung and vegetable matters are mixed to- 

 gether, such as horse dung, urine, straw, and hay, a degree 

 of heat is generated and disengaged by the absorption 

 of vital air, or oxygen, and water is decomposed. 



N' As 



