THE MONTHLY BULLETIN 



Head of Bull thistle, Cirsimn lanceolatum, showing 

 the seeds with their parachute-like appendages. This 

 illustrates a type of weed seed which is spread by the 

 wind. (Photo by O. W. Newman.) 



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STATE COMMISSION OF HORTICULTURE 



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SACRAMENTO, CALIFORNIA 



OCTOBER, 1915 



