WOOLLEN RAGS. 16t 



Woollen Raf^s. — Dr. Henry gives, as the ana- 

 lysis of 100 parts of wool : — 



with perhaps a trace of lime or some earthy 

 matter. 



Having thus given the analysis of wool, it 

 can scarcely be necessary to observe, that the 

 principal value of woollen rags as a manure 

 depends on the 55 parts of carbon in every 100 

 that they contain, which by the slow decay of 

 the sjtructure of the substance is very gradually 

 given out to the plant. 



These woollen rags are most extensively 

 used in Kent and Sussex, as a dressing for the 

 hop grounds, where they produce a very striking 

 effect. They have also been used on wheat 

 with very good results, but we should consider 

 them more adapted to beans and crops consist- 

 ing of carbonaceous matter, than w^heat. 



Irrigation. — The last fertilizer we purpose 

 noticing, is not the least valuable in the effects 

 it produces. In the paragraph on Water fp. 

 69,) we have given its chemical formation and 

 the changes it undergoes. Here the only sub- 

 ject for our consideration, is the effects pro- 

 duced by artificial irrigation, and the causes 

 to which such effects are attributable. 



It has been repeatedly tried to grow plants 

 in pure distilled water, free from any admix- 

 ture; but in every such case the plant has never 



