68 DISEASE IN PLANTS. 



treatment of the subject of soil the reader is referred to King, 

 The 6'(7z7 (Wisconsin, 1895), or Warrington, Lectures on the 

 Physical Properties of Soil (Oxford, 1900) ; Larbaletrier, 

 n Agriculture i^zxi?,^ 1888), chapters II. and III. There is 

 also a very good account in Bailey, The Pri7xciples of Agri- 

 culture (London, 1898), chapters I. -III. 



With reference to the organisms in soils and the decom- 

 positions they bring about, the student should consult Kramer, 

 Die Bakteriologie in ihren Beziehungen zur Landwirthschaft 

 (Wien, 1890), and Lafar, Technical Mycology (Engl, edition, 

 1898), sections V., VIII., and IX. 



