CONTENTS. 



Page. 



Introduction 3 



History 7 



The Earliest Workers 7 



The General Attitude of Pathologists and Bac- 

 teriologists 9 



Literature 21 



General Considerations 23 



On the supposed normal occurrence of Bacteria 



in Plants 23 



Literature 27 



Bacteria on the Surface of Plants 28 



Obstacles to their Entrance into Plants — 

 Obstacles to their Multiplication in 



Plants 28 



The Epiphytic species 30 



Literature 35 



The Entrance of Bacteria into Plants. The Ques- 

 tion of Parasitism — What Constitutes 



a Parasite? 36 



The Carriers of Infection 40 



Specific Diseases 40 



The Experimental Production of Parasites . . 41 



Literature 50 



Inception and Progress of the Disease 51 



Manner of Infection 51 



Wound Infections 51 



Infection through Natural Openings 54 



Nectarial Infections 54 



Water-pore Infections 56 



Stomatal Infections 57 



Lenticellate Infections 63 



Extrafloral Nectaries — The Stigma .... 64 



Period of Incubation 64 



Duration of Disease 66 



Final Outcome 67 



Tissues Attacked 69 



Mass-action of Bacteria 70 



Secondary Tumors and Metastasis 71 



Literature 75 



Solvent Action of Bacteria — Destruction of 

 Middle Lamellae — Bacterial Solution 

 of Cell-walls — Fermentation of Cellu- 

 lose — Destruction of Wood 76 



Literature 89 



Reaction of the Plant 9° 



Hyperplasias 90 



Hypertrophies 91 



Atrophies 92 



Enlargement of the Nucleus 92 



Changes in the Chromosomes 93 



Page. 

 Inception and Progress of the Disease — Cont'd. 

 Reaction of the Plant — Continued. 



Antibodies 93 



Literature 94 



Individual and Varietal Resistance — What 

 Constitutes Immunity.'' Immune 

 Varieties — Intra-varietal Selection — 

 Cross-breeding for Resistance — Is it 

 Possible by Special Foods to obtain 



Resistant Plants? 95 



Symbiosis 96 



Root-nodules of Leguminosae 97 



Synonymy of Bad. leguminosarum 99 



Summary of Leading Papers 1 00 



Literature 138 



Bacterial Symbiosis in other Green Plants. . 147 



Insectivorous Plants 147 



Bacteria in Hop Glands 153 



Bacteria with Algae 153 



Literature 154 



Bacterial Symbiosis in Cryptogams 155 



Bacteria with Yeasts 155 



Kefir 155 



The Ginger-beer Plant 162 



The So-called "Beer Seed " 166 



Bacteria with Fungi 168 



Bacteria with Myxomycetes 169 



One Bacterium with Another 172 



Literature 173 



Are any Bacteria known to cause Disease in 

 both Plants and Animals — Evidence 

 from Inoculating Plant Parasites into 

 Animals — Evidence from Inoculating 

 Animal Parasites into Plants — Do 



Plants Harbor Animal Parasites? .... 1 74 



Animal Parasites Inoculated into Plants 174 



Plant Parasites Inoculated into Animals 181 



Inoculations of Bacterium tumefaciens into 



Fish and Frogs 182 



Do Plants Harbor Animal Parasites 184 



Literature 187 



Hygiene of Plants 188 



Recovery by Excision 191 



Germicides 192 



Germicidal Treatment of Seeds 196 



Germicidal Treatment of Dormant Plants . . 201 



Germicidal Treatment of Growing Plants. . . 201 



Insecticides 202 



Formulae 204 



Literature 206 



III 



