10 



Descriptions of the Weed- seeds Illustrated on Opposite 



Page. 



22. Blue Weed. Stone-like in hardness ; about one-tenth of an 

 inch in length t surface roughened and of a gray color ; the scar is 

 large and triangular at flat end ; the ridge along the outer face is 

 convex. 



23. Mullein. About one-twenty-fifth of an inch in length ; thim- 

 ble-shaped ; base flat with scar at centre ; thimble slightly six-sided, 

 each side deeply pitted; pits of adjacent rows alternate; light to dark 

 brown. 



24. Rib-Grass. From one- eighth to one- twelfth of an inch in 

 length ; oval in shape with one face rounded, the other deeply grooved 

 bearing a central scar ; dark brown or amber colored. 



25. Ragweed. Ranging from one- fifth to one-twelfth of an inch 

 in length ; top-shaped ; apex pointed, and bearing a crown of four to 

 eight spines ; light to brown in color. 



26. Yarrow. Seeds about one-twelfth of an inch long ; small and 

 thin ; slightly egg-shaped ; color varying from yellowish-white to 

 gray. 



27. Ox-Eye Daisy. About one-twelfth of an inch long; ten 

 slender, white ribs running from end to end ; a knob at the broad end ; 

 and slightly club-shaped. 



28. Burdock. One-fifth to one-fourth of an inch in length ; pris- 

 matic and mottled ; four or five faces ; apex broader than base ; apex 

 star in centre of a distinct brown ring. 



29. Canada Thistle. From one-eighth to one-twelfth of an inch 

 in length ; brown in color ; somewhat spindle-shaped, but often 

 flattened ; top end cup-shaped with a rim and a small central knob. 



30. Chicory. From one-eighth to one-twelfth of an inch in length • 

 usually light brown ; usually cylindrical ; top flat and crowned with 

 scales. 



