CONTENTS. 



Page. 



Introduction ' 



Investigations of the carnation disease 1 )y Arthur and Rolley 8 



Description of the disease - - - ^ 



Lsolation of the genu '^ 



Difficulties met with in isolating the organism 10 



Infection experiments H 



Investigations of the disease in Washington 12 



Preliminary studies 12 



Microscopical investigations 13 



Cultures - , 15 



Infection experiments In 1897 17 



First colonization experiments with aphides 18 



Infection and colonization experiments in 1898 20 



Bacterial inoculations 21 



Antiseptic colonization 22 



Cause of the increase in the size of the spots 23 



Effect of the disease on the plant as a whole 25 



Methods of controlling the disease 26 



Conclusions 27 



