260 



EG YP TIAX A GR I Ci-L TURE. 



Of phosphoric acid it contains from less than \% to 

 as much as 1*75 % in exceptional cases; and of potash 

 from I % to over 2%. We may, say, however, generally 

 speaking, that it is as a nitrogenous manure that coufri 

 is employed, and that its value is mainly in proportion 

 to the percentage of this ingredient which it contains. 



The following table shows the composition of various 

 samples, according to recent analyses, which have been 

 made in the Laboratory of the Khedivial Agricultural 

 Society by Mr. Hughes. 



ANALYSES OF EIGHT RECENT SAMPLES OF COUFRI. 



The variable nature of the manure will be observed 

 from these figures, and it will be readily understood how 

 much more valuable some mounds are than others. In 

 fact this is so marked that it is always advisable, before 

 using any heap to ascertain its composition, in order to 

 avoid the transport of a mass of material which in many 

 cases can never rej ay the cost. 



From the analyses it will be seen that the amount of 

 soluble nitrogen in coufri is, approximately speaking, equi- 

 valent to 1 % of nitrate of soda. Tn other words for every 



