BACTERIOSIS OF BULBS. 53& 



twenty-four hours to a distance of 5-10 cm. through the leaf- 

 tissue. Infection of leaves and bulbs of common onion with 

 the same Bacillus was also successfully carried out, and the same 

 symptoms of disease followed. 



Sorauer, in his " Handbuch," describes a bulb-rot said to be 

 due to bacteria ; but whether it be the same disease as this 

 or not we cannot say. 



Bacterial Disease of Beans. 



Halsted^ describes a disease on cultivated beans, which caused 

 considerable loss in the United States. Bacteria were present in 

 large numbers in all diseased parts, but to what extent they 

 were responsible for the disease could not be exactly determined. 



IV. THE PATHOGENIC ALGAE. 

 The Cyanophyceae or Schizophyceae, though generally placed 

 with the Bacteria in the group of the Schizophytes, are here 

 included with the true Algae on account of the great resemblance 

 in their mode of life when they play the part of symbiotes 

 or parasites. 



The Diatomaceae contain no endophytic species. 

 The Algae differ from the groups of the Fungi, Myxomycetes, 

 and Schizomycetes, in their possession of chlorophyll and their 

 power of assimilation. The relationship of the Algae to other 

 living organisms may be expressed under the following heads : 

 I. Symbiosis of Algae with Fungi. (Lichens.) 

 II. Symbiosis of Algae with animals. 



III. Symbiosis of Algae with chlorophyllous plants. 



(a) Epiphytes. 

 (6) Endophytes. 



1. Inhabitants of free spaces in other plants. 



2. Inhabitants of domatia. 



IV. Parasitism of the endophytic Algae. 



(a) In relation to animals. 

 (6) In relation to plants. 



1. Inhabitants of the cell wall. 



2. Inhabitants of the cell cavity. 



3. Destroyers of tissues as a whole. 



■^ New Jersey Agric. Exper. Station, Eeport, 1892. 



