PRl-FACH. 



Tlio oxporimonts and o'n.sL'rv.aion.; wii rusts which are tho l)asis of 

 the foUowin*,^ notos woro l)oo-nn by Mr. Carloton sovoral years a,i!:o, 

 and wove continuod at intervals until the sprino- of llMIO, when the 

 pressure of othcM- duties prevented further work of this kind up to 

 the present time. The results obtained in tuan}' instances arc still 

 incomplete, but are of sufHcient value to he recorded. Some of the 

 species studied are of nuidi economic importance. The investigation 

 is a continuation of the work reported in bulletin 16 of the Division 

 of Vey-etable Phvsioloo-v and Patholoov. and is concerned chieflv with 

 the seg-reg-ation of rust forms of economic importance on the conuuon 

 grasses and the completion of the life historv of certain species. The 

 work is to be carried on more extensively during 1904. 



A. F. Woods, 

 P<ii]i(il(Hjixt and PJiyx/idoyisf. 



Office of Vfoktable PATiiOLOfiiCAL and 



Physiological Investigations, 



Washington^ Jj. C, March 26, lOOJf.. 



5' 



