822 



Popular Editions of Station Bulletins. 



The principal impurities found in the seed examinations are 

 shown in the table below: 



Principal Impurities Found in Seeds Examined in 1911. 



Number of Samples 



Alfalfa 



Red 



clover 



253 



16 



"6 

 147 



163 



20 



Alsike 

 clover 



86 



Tim- 

 othy 



98 



common weeds, 

 grasses, etc. 



Alsike clover 



Alriplex spp 



Barnyard grass. . . 



Brassica spp 



Catchfly 



Chickweed 



Cinquefoil 



Crab-grass 



Daisy, ox-eye . . . , 

 Daisy, yellow . . . , 

 Foxtail, green , . . . 

 Foxtail, yellow. . . 

 Lady's thumb. . . . 

 Lamb's quarters.. 



Mallow 



Mayweed 



Melilot 



Pepper grass 



Pig weed 



Plantain, broad. . . 

 Primrose, evening. 



Ragweed 



Sorrel 



Sweet clover 



Timothy 



Trefoil 



White clover 



Number of Samples 



Alfalfa 



14 



70 



9 



76 



20 



377 

 161 



'225 

 50 



"5i 



91 



49 



5 



Red 

 clover 



106 



12 

 52 



148 

 27 

 65 

 95 



24 



73 

 96 



ioi 



20 



Alsike 

 clover 



37 



"5 

 '22 



"i 



17 



3 



12 



50 



'63 

 60 



Tim- 

 othy 



71 



2 

 7 

 6 



28 

 4 

 3 



21 



40 

 "6 



'41 



'65 

 37 



'36 



•An impurity is considered an adulterant when it exceeds a certain fixed percentage of the sam pie. 



Several samples of oats were received with 

 Sulphured special requests for germination tests, as growers 

 oats. wtio h^d sown seed from lots represented by these 



samples found that only a few seeds grew. 

 The unusually light-colored, bright, smooth, vigorous appear- 

 ance of the samples of seed led to the suspicion that it had been 

 treated with sulphur fumes, a bleaching agent; and examination 

 made in the Chemical Laboratory of the Station proved sulphuric 

 acid present in injurious amounts. Germination tests made of 

 four samples showed fourteen per ct. of live seed in one sample, 

 one per ct. in the second sample and all seeds dead in two samples. 

 Bleaching, if properly done, probably does not injure oats for 

 feeding and may not reduce the viability ; but particularly bright 

 looking seed should be given a germination test before using. 



