8 CONTENTS. 



Pliy.-iological characters of the organism — Continiieil. Page. 



Gas 30 



Action on lead acetate 31 



Indol ^ 32 



Nitrates reduced to nitrites 32 



3Iaxlmnm temperature 33 



Mininunn temperature 34 



Optinmm temperature 34: 



Thermal death point 35 



Diffused light 38 



Direct sunlight _ . _ 36 



Effect of nitrogen 36 



Effect of carbon dioxid 37 



Effect of hydrogen 38 



Comparison of calla-rot germ "with similar organisms 38 



Bacillus carotororus Jones 38 



Bacillus oleracae Harrison 39 



Heinz's hyacinth germ {Bacillus hyacintlii septicvs) 39 



Potter's Pscudomorias destructans 40 



Origin and spread of the disease 40 



Remedies 42 



Summary 43 



Description of plates 46 



