agricultXjre with chemistry. 97 



The importance of making or obtaining the greatest 

 quantity of manure with the materials now generally 

 kno\\ n, 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 ceconomy 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. 



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 respefls similar to, and was a 

 true peat ; hence the praclical 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 



