54. 



18. Determine the kinds of weeds found in the following 

 places : The corn fields, garden, roadsides, pasture and in vacant 

 lots, door yards and barn yards. 



19. After these points have been carefully studied and the 

 habits of the plants determined, suggest a method of extermina- 

 tion of weeds studied. 



20. Determine the yield of corn or other crops per acre in 

 some clean fields and compare them with some weedy fields. 

 Which fields give the largest yield. 



21. Become familiar with a few poisonous plants such as 

 poison ivy, which is frequently a climbing plant, jimson weed, 

 a rank smelling herb with large white flowers, the cowbane with 

 clustered roots and clustered white flowers in umbels like parsnip. 



BIBLIOGRAPHY. 



The following papers and books may be used for reference: 



Pammel, L. H. Some weeds of Iowa. Bull. la. State College 

 Experiment Station, Ames, 70. Russian thistle, Bull. 26; Quack 

 and Wheat grasses, Bull. 83; Press bulletins, 11, 12 and 13. 

 These may be had, except No. 70, by writing Prof. Curtiss, Ames. 



Pammel, L. H. and Charlotte M. King. Notes on Eradication 

 of Weeds with experiments made in 1907 and 1908. Bull. 105. 

 Iowa Agricultural Experiment Station. 



Results of Seed Investigations for 1908 and 1909. Bull. 115. 

 See also Bull. 88 of the same station by L. H. Pammel, R. E. 

 Buchanan and Charlotte M. King. Iowa Agricultural Experi- 

 ment Station. 



Pammel, L. H. Weeds of the Farm and Garden. Orange Judd 

 Co., New York. About 300 pages. In press. 



Floras and Manuals. The following cover our territory. 



Britton. Manual of the Flora of the Northern States and 

 Canada. Henry Holt & Co. 



Robinson and Fernald. Gray's Manual of Botany of Northern 

 United States. American Book Co. 



Clark, Geo. H. & Fletcher, J. Farm Weeds of Canada. Pub- 

 lished by the Department of Agriculture, Canada. Price $1.00. 



Htichcock, A. S. & Geo. L. Clothier. Report on Kansas Weeds. 

 Bulls. Kansas Agricultural Experiment Station, 57; 80. 



