[dymond] elevator SCREENINGS 79 



The latter material is usually further separated in practice by the 

 removal of Scalpings (the larger seeds) consisting of shrunken kernels 

 and the larger pieces of wheat and oats, wild oats and some wild 

 buckwheat. The material left is known as Buckwheat Screenings and 

 is made up of wild buckwheat, cracked wheat, and a few of the larger 

 weed seeds. The material passing through the 1/14 inch sieve is 

 called Black Seeds on account of the preponderance in it of lamb's 

 quarters. The average run of elevator screenings consists of approx- 

 imately 40 per cent black seeds. A representative sample of black 

 seeds gave the following analysis : 



Composition of Black Seeds 



Small pieces of wheat, oats, barlej' and flax 17-4% 



Wild buckwheat 4-2% 



Lamb's quarters 45-4% 



Brassica sp. (140) 2-8% 



Seeds of other species of Cruciferge 5-6% 



Sisymbrium altissimum L (544) 



Conringia orientalis (L.) Dumort (180) 



• Thlaspi arvense L (44 ) 



Camelina sativa (L.) Crantz (28 ) 



Neslia paniculata (L.) Desv (28 ) 



Erysimum cheiranthoides L (20 ) 



Lepidium apetalum Willd (8 ) 



Capsella Bursa-pastoris L (8 ) 



Other sorts 4-6% 



Chaff 20- % 



The material left after the removal of the black seeds from 

 screenings is usually separated into Scalpings and Buckwheat Screenings 

 as explained above. Together these make up about 60 per cent of the 

 average elevator screenings. These materials vary a great deal in 

 composition but when properly recleaned should contain comparatively 

 few seeds as small as lamb's quarters. 



Following is the average of the analyses of samples of buck- 

 wheat screenings purchased from different elevator companies by the 

 Experimental Farms Branch during the summer of 1919. 



Composition of Buckwheat Screenings 



Cracked, broken and small wheat 35 % 



Oats and Barley 1-6% 



Flax 2-5% 



Wild oats. . , 6-2% 



Wild Buckwheat 41-0% 



Seeds of Cruciferie species 2-8% 



Lamb's quarters • 0'4% 



Other seeds 1-4% 



Chaff 9-1% 



Sec. V, Sig. 6 



