844 CONTRIBUTIONS TO OUR KNOWLEDGE OF SOIL-FERTILITY, xii., 



to 2-3% in a chocolate loam(W.H.C. = 36). Treatment with 

 varying quantities of toluene showed that all percentages, up to 

 twenty, failed to destroy the protozoa, taking Colpoda cucullus 

 as being typical of the ciliates, Cercomonas or Trepomonas as 

 representing the flagellates, and the usual Amceba Umax or lobosa 

 for the amcebse. 



'O 



The two extreme soils, one with a W.H.C. of 16, and the other 

 of 36, were put into jars, and water was added to over half the 

 water-holding capacity. They were kept for two months at the 



