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ORGANIC NITROGENOUS MANURES 



textile waste products. Frequently, however, they are mixed with 

 quantities of cellular material like cotton and linen fibre which has 

 no fertilising action. Small portions of the sample, or suspicious- 

 looking fibres taken from it, should be subjected to the following 

 tests, which should also be carried out with pure material : — 



Except direct cotton dyes like those derived from benzidene. 



