262 The Botanical Gazette. [September, 



extending and increasing such records we might eventually 

 prognosticate with a fair amount of certainty in regard to the 

 probable occurrence of a disease during the coming season, 

 and to state what measures should be taken to hold it in check. 



Remarks on a National arbor etiitn: B. E. Fernow. — After 



giving reasons why an extensive arboretum at Washington, 

 under the control of the government, would be a valuable 

 acquisition in promoting the development of forestry and allied 

 interests, he presented resolutions addressed to Congress look- 

 ing to the initiation of such an undertaking. The resolutions 

 were favorably considered, being commended by Messrs. Ward, 

 Riley, Beal, Arthur and others, and were addressed to the 

 Biological Section for further action. 



/Votes on a 



>/ 



D. G. Fairchild. — An account with drawings and photo- 

 graphs of the dying of the stems, apparently caused by the 

 presence of a mycelial fungus under the bark. No conidial 

 or other fruiting stage was found, although the fungus 

 was made to grow luxuriantly upon slices of potato, agar- 

 agar, etc. 



/ 



J. N. Rose. — Oro- 



banche racemosa occurs in tobacco and hemp fields in Ken- 

 tucky, and is also reported from one locality in Illinois. What 

 is locally known as Russian cactus, supposed to have been in- 

 troduced by Russian Jews, has become a pest in the wheat 

 fields of N. Dakota. It is a species of Salsola. Prof. L. H. 

 Bailey gave an instance of a new introduction spreading at 

 first in a very threatening manner, but which had practically 

 disappeared in four years after. He thought it required a 

 number of years of observation to say with much certainty 

 that a new plant will make a pernicious weed. 



The tubercles on the roots of Ceanothus : GEO. F. ATKIN- 

 SON - — Tlle tubercles discovered by Prof. Heal, and reported 

 upon tast year before the Club, were found upon further Study 

 to be caused by a parasitic fungus allied to' Schinzia Alni, 

 found upon the roots of Alnus and Eleagnus, and now trans- 

 ferred to the genus Frankia. 



Notes on the arrow weeds or jumping seeds of Mexico and 

 Central America: C. V. Riley.. _ These plants, which are 



used by the natives to poison arrows, and the seeds of which 



