HISTORY AND BIBLIOGRAPHY 841 



French, C. An introduced weed {Hypericum perforatum). Jour. 

 Dept. Agr. Victoria. 1903 : 65-67. 



Garcke, August. lUustrierte Flora von Deutschland. 795. Ber- 

 lin, 1903. 



Gleditsch, J. G. Systematische Einleitung in die neue Forstwissen- 

 schaft. 544. Berlin, 1775. 



Gmelin, J. F. Abhandlungen von dem Arten des Unkrauts auf 

 den Aeckem in Schwaben. 408. Lubeck, 1779. 



Goff, E. S. Noxious weeds. Bull. Wis. Agr. Exp. Sta. 39 :38. 

 Noxious weeds of Wisconsin. Bull. 76:52. 

 The Russian thistle. Bull. 37 :13. 

 Gray, Asa. Burs in the Borage family. Am. Nat. 10:4. 



Pertinacity and predominance of weeds. Am. Jour. Sci. 

 18:161-167. Also in Scientific Papers. 2:234-242. 

 Greene, E. L. Is Bhus glabra in Canada? Ottawa Nat. 22 :179-181. 

 Greif, 0. Queekenvertilgung. Mitt. Deutsch. Landw. Ges. 1906 : 



339. Abs. in Just's Bot. Jahrb. 9:482. 

 Haglund, E. Characteristic weeds on cultivated marsh soils. See 

 Svenska Mlosskultur for Tidskr. 25 : 238-245. Note in Exp. 

 Sta. Rec. 26 :538. 

 Halstead, B. D. American and English weeds compared. PL 

 World. 3:171-173. 



Our worst weeds. A scale of points. Proc. Soc. Prom. Agr. 

 Sci. 10:43-49. 



Preliminary list of Iowa weeds. Bull. Dept. Bot. la. Agr. 

 Coll. 1888 : 36.54. 



The weeds of New Jersey. Agr. Rept. N. J. Agr. Exp. Sta. 

 1890 : 370-453. 

 Harper, R. M. Some native weeds and their probable origin. 



Bull. Torr. Bot. Club. 35 :347-360. 1908. 

 Harrison, F. C. Weeds of Ontario. Ont. Dept. Agr. 80. Toronto, 



1900. 

 Harrison, F. C, & Lockhead, W. Some common Ontario weeds. 



Bull. Ont. Agr. Col. & Exp. Farm. 128:96. 

 Hartig, Theodor. VoUstandige Naturgeschichte der forstlichen 



Kulturpflanzen Deutschlands. 584. Berlin, 1851. 

 Harvey, F. L. Maine weeds. Rept. Me. Agr. Exp. Sta. 1891: 

 179-181. 

 Three troublesome weeds. Bull. Me. Agr. Exp. Sta. 32 :8. 



