THE CONCENTRATES 



171 



is the only safe position to take towards whole screenings. Finely- 

 ground screenings often make satisfactory and cheap feeds, and, if 

 carefully ground, are not, as a rule, objectionable. Poisonous weed 

 seeds, like corn cockle, are found in most screenings, but they are 

 ordinarily not present in sufficient quantities to give rise to any 

 trouble in stock feeding. Sheep and poultry appear to be able to 



FIG. 33. Weeds growing from seed found in a mixed "dairy feed." This contained 

 100,000,000 weed seeds to the ton. The soil waa sterilized, so that it is certain that every 

 plant grew from a weed seed in the feed. Most samples of whole screenings contain still 

 larger numbers of weed seeds. (Vermont Station.) 



destroy weed seeds of screenings more thoroughly than other farm 

 animals, and do well on them. 



The accompanying illustration (Fig. 33) shows a luxurious 

 growth of different weeds from seeds found in a mixed dairy feed. 

 This feed was made up largely of whole grain screenings and con- 

 tained about 100 million weed seeds to the ton. Most samples of 

 grain screenings contain still larger numbers of weed seeds. 



Screenings are often used in the manufacture of mixed feeds 

 and molasses feeds, in the latter case serving as absorbent for the 



