MANURES. 279 



These qualities are sold for 75 P.T. per ton. 



The longer the material is allowed to remain the drier 

 it becomes, and consequently relatively richer. When 

 quite dry, ground up and sieved, it is sold as " Poudrette," 

 at the rate of 110 P.T. per ton for the quality known as 

 "best." The composition of this material is as follows : 

 nitrogen, varying from 1'75 to %% ; phosphoric acid about 

 3% ; and potash about '5%. When purchasing, a guaran- 

 teed analysis is obtained. The material is sold loose in 

 order to economise sacks. A quality of poudrette known 

 as "best best" and containing 2*25 % of nitrogen is sold 

 for P.T. 125 per ton. 



The prices at which these manures are sold are consi- 

 derably below those at which they are offered in European 

 countries, and it is to be regretted that the quantities 

 produced are so relatively small . As organic manures, they 

 are valuable for the general improvement of poor soils, 

 and when enriched by the addition of chemical manures 

 may with advantage be used for any crop. They decom- 

 pose somewhat slowly in the soil and after the removal of 

 the crop, leave a considerable amount of residue. The best 

 kinds of poudrette are well able to bear the cost of transport, 

 but the production is only 500 tons per year, while of the 

 Matieres Premieres about 1500 tons are produced. There 

 is a considerable quantity of inferior material, mixed with 

 earth, stones, etc., which though useful on poor soils, 

 wanting in humus, can scarcely bear the cost of transport 

 for a considerable distance. 



In addition to poudrette, various other manures are sold 

 by the Cairo Sewage Transport Company, Ltd. The refuse 



