100 EXCREMENTS AND URINE. 



components, as by straw, and greater quantities of 

 the former must therefore be employed to provide a 

 dry bed for the animal. From this circumstance, as 

 also from the inconsiderable amount of mineral in- 

 gredients contained in this litter, it is very easily ex- 

 plained why the manure procured from bedding with 

 fallen leaves is so greatly inferior in its action on the 

 soil to that obtained from straw. 



3. Human Excrements and Urine. 

 The composition of human excrements, when de- 

 rived from an invigorating but moderate quantity of 

 animal and vegetable diet, may he assumed to be the 

 following : — 



The relative value of the urine, when compared 

 with the faeces, is more favorably shown than in the 

 foregoing table, if the inquiry is proposed in the fol- 

 lowing terms : How large a quantity of manuring 

 ingredients is yearly eliminated by one man in the 

 solid excrements and urine respectively ? Very ac- 

 curate analyses have shown that the amount of wnwe 

 contains double the quantity of phosphoric acid, four 



