Eradication of the Canada Thistle. 123 



and other noxious weeds from a perma- 

 nent pasture in the Ontario Agricultural 

 College Experiment Station farm at 

 Guelph may prove interesting. The field 

 contained twenty acres, and had been for 

 several years in permanent pasture, and 

 was badly smitten. The experiment com- 

 menced in the summer of 1889, and the 

 work was superintended by the writer, who 

 also took part in it. The facts, as given 

 in the annual report of the station for 189 1, 

 p. 50, are as follows : "The first spudding 

 in 1889 took fully 100 hours of one per- 

 son. The second si)udding took 80 hours. 

 In 1890 the first spudding was done on July 

 9th and loth, and took 40 hours. The sec- 

 ond spudding was done from August 26th 

 to September 7th, and took ^2 hours. In 

 1891 the first spudding w^as done on July 

 1 8th, and took 7 hours. The second spud- 

 ding was done on about the last day of 

 September, and took 6 hours. The cost of 

 cleaning the field — for it is now clean — was 

 $22.50 in 1889, $9.00 in 1890, and $i.62>^ 

 in 1891 ; or a total, for the three years, of 

 $33.i2j/< for the 20 acres. The labor was 

 valued at $1.25 per day of 10 hours, with- 

 out board." The annual cost of maintain- 



