CONTENTS. 



Page 



Historical ... 9 



Source of material _ 10 



Inoculations of 1 897 ... 10 



Series 1 (hyacinths) 10 



Series 2 (onion) .. 18 



Natural infection of a daughter bulb _ 18 



Inoculations of 1898 19 



Series 3 (hyacinths) 19 



Series 4 (onions) .. ._ 20 



Series 5 (hyacinths) 20 



Series 6 (Roman hyacinths) /. 23 



Series 7 (hyacinths) 28 



Series 8 (hyacinths) 25 



Series 9 (hyacinths) 26 



Series 10 (hyacinths) 26 



Series 11 (cabbage) .. 27 



Series 12 (amaryllis). 28 



Series 13 (hyacinths) 28 



Series 14 (hyacinths) . 29 



Series 15 (onions) ._ 30 



Series 16 (hyacinths) 30 



Series 17 (hyacinths) 31 



Series 18 (plunge experiment) 82 



Inoculations of 1899 ., 33 



Series 19 (hyacinths) 33 



Remarks on pathogenesis . 33 



Morphology of the parasite _ 36 



Size and shape 36 



Motility 37 



Zoogloeae 38 



Spore formation 39 



Involution forms 39 



Behavior toward stains 40 



Synopsis of characters 40 



Remarks on relationship 42 



Explanation of illustrations 44 



I 



