122 



PERUVIAN GUANO POULTRY MANURE 



Storer gives as the percentage composition of the fresh excreta of 

 the common domestic birds 



He gives as an estimate of the quantities produced by each bird 

 per year pigeon, 6 Ib. ; hen, 12 Ib. ; duck, 18 Ib. ; goose or turkey, 

 25 Ib. 



Ulrich l gives the following as the average percentage composition 

 of the dung of poultry 



He estimates the annual production at 



a Biedr. Zentr., 1900, 3; Jour. Chem. Soc., 1900, Abstracts, ii, 308. 



