EXPERIMENT STATION BULLETINS. 



249 



iu resi)ect to presence of over two per cent of noxious weeds (Section 

 G), a total amount of forei^i seed over five per cent (Section 7), total 

 foreign matter over five per cent (Section 7), inert matter over five 

 per cent (Section 7) and the jM'oportion of ingredients of mixtures not 

 shown (Section 1), 



TABLE I.— SAMPLES OF SEEDS VIOLATING THE PURE SEED LAW. 



Samples. 



Official 1911. . 

 Official 1912. . 

 Unofficial 1911 

 Unofficial 1912 



a 



444 

 160 

 303 

 309 



Noxious 



seeds 



two per cent 



or over. 



Total 



foreign 



seed 



five per cent 



or over. 



No. 



38 



12 



6 



5 



Per 

 cent. 

 8.3 

 7.5 

 2.0 

 1.6 



No. 



100 

 23 

 13 

 30 



Per 

 cent. 

 22.5 

 14.4 

 4.3 

 9.7 



Total 



foreign 



matter 



five per nent 



or over. 



No. 

 246 

 78 

 122 

 109 



Per 



cent. 

 55,4 

 48.7 

 40.2 

 35.2 



I 



Inert 

 matter 



five per cent ^„ 3 

 or over. , °-~ 



6 ° 



No. 



139 

 40 

 96 

 75 



Per 

 cent. 

 31.3 

 25.0 

 31.7 

 24.3 



44 

 11 



Mixtures 



with per 



cent of 



ingredients 



not given. 



Per cent 

 of total 

 No. mixtures 

 42 94.6 

 11 100 



TABLE II.— OCCURRENCE OF SEEDS OF NOXIOUS WEEDS. 



( 



Number of samples in which these 

 seeds appear. 



Name of weed. 



Agropyron repens — 



Quack grass 



Brassica arvensis — 



Charlock 



Brassica juncea — 



Indian mustard 



Brassica nigra — 



Black mustard 



Camelina sativa^ 



False flax 



Carduus arvensis— 



Canada thistle 



Cichorium intybus — 



Wild Chicory 



Chrysanthemum leucanthe- 



mum — Ox-eye daisy 



Cuscuta sp. — 



Dodder 



Daucus carota — 



Wild carrot 



Hieracium aurantiacum — 



Orange Hawkweed 



Linaria linaria — 



Butter and eggs 



Plantago lanceolata — 



Rib-grass or Buckhorn 



Plantago rugelii — 



Rugel's Plantain 



Silene noctiflora — 



Night-flowering Catchfly . . . 

 Thlaspi arvense — 



Penny cress 



Total number of samples 

 each year 



Total appearance of nox- 

 ious seeds 



Official 



1911. 



No. Pet. 





 4 

 3 



6 

 8 

 22 

 4 

 2 

 7 

 6 

 



.7 

 1.4 

 1.8 

 5.0 

 .9 

 .4 

 1.6 

 1.4 

 



Official 



1912. 



No. Pet. 







161 36.3 



135 30.4 



51 11.5 







444 







3.1 















11 7 



1 



.C 

 3.1 

 4.4 

 1.2 

 

 



Unofficial 



1911. 

 No. Pet. 



Unofficial 



1912. 

 No. Pet. 



69 43.1 



48 30.0 



8 '5.0 



1 0.6 



160 



409 



147 







43 14.2 



40 13.2 



6 2 

 



303 



Number of samples in which these seeds 

 appear two per cent or over. 



Official 



1911. 



No. Pet. 



132 







60 19.4 



27 8.7 



11 3.6 







309 



157 







1 .2 

 







































18 4.1 



8 1.8 



2 .4 

 



Official 



1912. 



No. Pet. 



29 



































O' 















9 5.6 



2 1.2 











Unofficial 



1911. 

 No. Pet. 



11 



















































3 1 



3 1 











Unofficial 



1912. 

 No. Pet. 



