Index to American Mycological Literature 51 



officers of the Phytopathological Society are : E. C. Stakman, pres- 

 ident; N. J. Giddings, vice-president; Perley Spaulding, editor-in- 

 chief, with L. L. Harter and G. M. Reed, assistants. The meeting 

 next year will be held in Boston. 



The most popular address was probably that by Prof. Bateson 

 on "Evolutionary Faith and Modern Doubt." The symposium 

 on the " Utility of the Species Concept " was important and well- 

 timed. Dr. Millspaugh was unfortunately kept away by illness. 

 Mosaic diseases occupied a prominent place at the meeting, about 

 20 papers being presented dealing with this subject. Dr. Duggar 

 experimented with the mosaic disease of tobacco and found that 

 the " virus " niters through porous cups as a liquid and therefore 

 can not be a germ or similar organism. He termed it a " living 

 fluid contagion." Experiments by Johnson, who has long worked 

 on tobacco mosaic, led him to make the following statement : " It 

 seems, therefore, that these results furnish evidence against the 

 enzymatic theory of mosaic, while at the same time they favor 

 parasitic hypothesis, since the temperature curve for the develop- 

 ment of mosaic corresponds closely with that of the development 

 of many of the plant pathogens." 



Freda Detmers discussed the parasitic effect of Poronidulus con- 

 chifer on elm branches, claiming that it seems to be more injurious 

 at times than suspected. L. M. Massey discussed " Fusarium- 

 rot " of the Gladiolus. The corms become infected in the field 

 and the rot advances in storage. The fungus seems to be Fusa- 

 Hum oxysporum Schecht. A poplar canker, caused by Hypoxylon 

 pruinatum, was described by Povah. This disease is a trunk 

 canker, which blackens the sapwood. It is very serious in certain 

 sections. W. H. Snell spoke of the effect of heat upon the 

 mycelium of certain structural timber-destroying fungi within 

 wood, concluding that heating structures affected with decay to 

 47-48 0 C. by means of the heating systems, as has been suggested, 

 would not kill the fungi even in moist cotton weave sheds, although 

 the drying effect would be beneficial in certain types of structures. 

 The application of these results to the effect of kiln drying upon 

 structural timber decay was pointed out. R. J. Blair spoke of 

 experiments with storing wood pulp in water to protect it from 



