SPECIES AND 



197 



meal, sheep and goat manure, peptone, fish guano, and bat guano. 

 He found that while all produced ammonia, their efficiency varied 

 greatly, depending upon the nature of the soil and the nitrogenous 

 material to be ammonified, B. tumesccns, however, on the whole 

 appeared to be the most efficient organism tested. 



FIG. 28. Ammonifying bacteria. 1. Proteus rulgaris; X 2,600. (Rodella.) 

 2. Bacillus megatherium; X 2,600. (Hinterberger.) 3. Bacillus my coides; X 2,600. 

 (Emmerling.) 4. Bacillus cercrts; X 2,600. (Wilhelmy.) Lipman's "Bacteria in 

 Relation to Country Life." 



Moreover, many fungi, as shown by McLean and Wilson, possess 

 the power of rapidly ammonifying cotton-seed meal and dried blood. 

 Fungi belonging to the Moniliaceas were more active ammonifiers 

 than were members of the Aspergillacece, Mucoraceoe, or Dematiacece. 



An idea as to the number of ammonifying organisms which must 

 occur in soils may be gleaned from the fact that Conn found about 

 10 per cent, of a soil's flora to be rapid liquefiers, principally Ps. 



