1909.] 



PUBLIC DOCUMENT — No. 31. 



33 



the poisonous principle it contains. It is, however, a very easy 

 matter to identify this seed when found, as its markings are 



ChlARLOCK 



CORN „,.,.,^, 

 COCKLE^*^ JIMSONWEEO 

 DODDER 



RIB GRMSS 



BRACTED 

 PLANTAIN 



BIN DWEED 



LADY'S 

 THUMB 



BOUNCING BET 



GREEN 



YELLOW 



FOXTAIL 



LAMB'S 

 QURF^TERS 



SH E1£I P 

 CURLED DOCK BlTTEP.3Qp^p^^j_ 



DOCK 



Common Weed Seeds, magnified aljout Ten -Diameters. 



characteristic. It is from Vs to %6 of an inch long and about 

 three-fourths as broad; shaped very much like a small lima 



