HISTORY AND BIBLIOGRAPHY 845 



Weeds of corn fields. Bull. la. Agr. Exp. Sta. 39:27-52. 

 Weeds of pastures and meadows. Bull. la. Geol. Sur. I: 



448-463. 



Weeds of southwestern Wisconsin and southeastern Minne- 

 sota. 20. ' St. Paul, 1887. 

 Pammel, L. H., and King, C. M. Notes on eradication of weeds 



with experiments made in 1907 and 1908. Bull. la. Agr. Exp. 



Sta. 105:265-300. 

 Parish, E. B. The vegetation of Plymouth 300 yrs. ago. Rhodora. 



3:17. 

 Parish, S. B. Notes on some introduced plants of southern Cali- 

 fornia. Muhlenbergia. 5 :109-115. 

 Pease, A. Certain railroad weeds of northern New Hampshire. 



Rhodora. 11:30. 

 Petersen, N. F. Flora of Nebraska. 217, Lincoln, Neb., 1912. 

 Piper, C. V. Pernicious weeds among emigrants. Yrbk. U. S. 



Dept. Agr. 1908: 246. 

 Prentiss, A. M. Weeds (Hawkweed and Beard-tongue). Bull. 



Cor. Agr. Exp. Sta. 37:366-371. 

 Ratzeburg, J. T. C. Die Standortsgewachse und Unkrauten 



Deutschlands und Schweiz in ihren Beziehung zu Forst-Garten- 



und Landwirthsehaft und zu andern Fachern. 487. 12 tab. 



Berlin, 1859. 

 Reum, J. A. Grundriss der deutschen Forstbotanik. Ed. 2. 489. 



Dresden, 1825. 

 Romer, F. Zur Flora advena von Polzin in Hinterpommern. 



Verhandl. Bot. Ver. Provinz Brandenburg. 1908 : 124-128. 

 Zur Flora von Kolberg in Hinterpommern. Verhandl. Bot. 



Ver. Provinz. Brandenburg. L. 1908: 177-180. 

 Sayre, L. E. Loco weed. Trans. Kan. Acad. Sci. 18 :141-144. 

 Schorler, B. Bereicherungen der Flora Saxonica in Jahre 1898. 



Abh. d. Naturw. Ges. Isis. Dresden, 1898:97-99. Heft 2. 

 Schultz, G. Charlock and white radish. Arb. Deut. Landw. Gesell. 



1909: 78 (No. 158). Abs. in Exp. Sta. Rec. 23:732. 

 Selby. A. D. A first Ohio weed manual. Bull. Ohio Agr. Exp. 



Sta. 83 :249-400. 



A second Ohio weed manual. Bull. 175 :191-274. 



The Russian thistle in Ohio and weeds in general. Bull. 



55 :53-69. 

 Smith, W. G. A hundred Yorkshire weeds. Yorkshire Col. & E,. 



& W. Ridings Joint Agr. Council. 12. 



