PR I: FACE, 



Tho at'companying: paper treats of a disease of the white ash caused 

 b)' Polypoi'K.^ fra,ri)it>jihlhis, concerning- which a nuniher of in<]uiries 

 have hitely been made. It has been carefully studied ))y Dr. Hermann 

 von Schrenk, who has charoe of the Mississippi \'allev Lal)orator\ of 

 Vegetable Pathological and Physioloo-ical Investioations, located at 

 St. Louis. This disease is pievalent in the ^Mississippi Valley, which 

 is the western limit of the white ash, and is particularly severe in 

 Missouri. Nebraska, and eastern Kansas, fully 5^»0 per cent of the trees 

 in some localities beino- affected. The ash is extensively o-rown in 

 parks and grounds, where the white rot does considerable damage. Its 

 mode of growth and entrance into the tree may be taken as a type 

 for many wound parasites destroying ornamental and shade trees, 

 and it is believed that a knowledge of its life history and the methods 

 to be used for comliating it will prove of considerable benefit at this 

 time both to foresters and others interested in the preservation of 

 trees. 



Albert F. Woods, 

 Pathologist and PI ly biologist. 

 Office of the Pathologist and Physiologist, 



Washington, D. C, Octoh,r 17,1902. 



