E. J. Russell and E. H. Richards 



559 



Table VIII. Showing range of variation in composition between the 

 two samples drawn as described on pp. 557-58. 



Rothamsted Manure Heaps, 1915-16. 



Cow dung from a neighbouring dairy farm. 



Series G. 



All these heaps were made from the same lot of dung which had gradually accumulated in the yard. 



