Part I jmhlished Avfjust 18, 1914. 

 Part II published December 3, 1914, 

 Part III published April 17, 1915. 



IDrmteD foe tbc IRo^al Ibocttcultural Soctcti? 



BY 



SPOTTISWOODE & CO. LTD., LONDON, COLCHESTER AND ETON 



