214 CROWN-GALL. OF PLANTS. 



Page. 



Soil, trees infected through 186, 188 



Species, varieties, and races of the crown-gall organism, discussion of question of. 157 



Spisar, sugar-beet gall, work on 194 



Staining bacteria in tissues, difficulty of 167 



Stains, behavior toward 107, 127 



Starch jelly, growth on 110, 146 



Stewart, apple trees, effect of crown-gall on 187 



Stimulus to growth, probable nature of 175 



Stoklasa's work on beet tumor 18 



Strohmer and Stiff: Chemical analysis of crown-gall 173 



Structure of tumors 159 



Sugar-beet gall, isolation from 81 



Sugared peptone water, growth in 112 



Summary 197 



Sunlight, sensitiveness to 124 



Susceptibility of young and old tissues 158 



Temperature, maximum 121 



minimum 122 



optimum 120 



relations 120 



Tender tissues, greater susceptibility of 158 



Thaxter's work on peach tumor 19 



Thermal death point 120 



Tissue primarily affected by gall 159 



Tissues, young and old, relative susceptibility of 158 



Tourney, almond trees, injury due to crown-gall 183, 185 



nuclei, several in a cell 160 



oxydizing enzymes of almond gall 173 



work on almond tumor 19 



Treatment, methods of 196 



Trevisan's description of Bacillus ampelopsorse 15 



Tuberculosis of beets 194 



Turnip gall, isolation from 105 



Turnip organism: 



Acid fast 132 



Cultural characters 140, 141 



Flagella 132 



Gram's stain 132 



Inoculations 105 



Measurements 132 



Pathogenicity 132 



Spores 132 



Tyloses 163 



Unfruitfulness of trees attacked by crown-gall 177 



Urea and dextrose in river water, growth in 153 



Uschinsky's solution, growth in 114 



-fpeptone, growth in 147 



Varieties of crown-gall organism 157 



Vegetative cells 105, 127, 128, 129, 130, 131, 132 



Virulence, loss of 126, 140, 157, 165, 177 



Vitality on culture media 120 



Von Thiimen's work on rogna 17 



213 



