18 Ghain Screenings. 



used in all terminal elevators. They therefore represent, as accurately 

 as possible, the average run of the different materials, "entire screen- 

 ing," "entire screenings, black ^eeds removed," "black seeds," 

 and "buckwheat screenings." These were all finely ground in the 

 feed mill of the Ogilvie Company. The material, after passing 

 through an attrition mill, was separated into two portions, coarse 

 and fine, by a reel. The coarser portion was further reduced by a 

 "Perplex" grinder. 



Small samples of both the unpulverized and the pulverized 

 screenings were -taken for analysis every few minutes before and 

 during the grinding. 



BOTANICAL ANALYSES. 



Following is the botanical analyses of the different materials 

 used in the feeding experiments. The numbers after the names of 

 weed seeds indicate the relative proportion by number of the various 

 weed seeds found :^- 



Screenings. — Wheat 32 per cent, oats 2-6 per cent, fiax 6-1 per 

 cent, wild oats 2-8 per cent, wild buckwheat 11-7 per cent, lamb's 

 quarters 20 • 2 per cent, wild mustard (91)1-8 per cent, other mustards 

 2 • 5 per cent (hare's-ear mustard 53, tumbling mustard 341, worm-seed 

 mustard 28, ball mustard 13, stinkweed 14, peppergrass 11, western 

 false, flax 8, flat-seeded false flax 1), other weed seeds 2-2 per cent 

 (wormwood 194, cinquefoil 26, green foxtail 31, Russian pigweed 25, 

 evening primrose 30, American dragonhead 14, plantain 10, catchfly 

 8, timothy 7, alsike 7, Canada thistle 6, blue grass S, western rye grass 

 4, ergot 3, gumweed 3, mint 3, western cone-flower 2, purple cockle 2, 

 crepis 1, witch grass 1, pale plantain 1, hedge nettle 1, prairie rose 1, 

 road-side thistle 1, sow thistie 1), chaff 18-1 per cent. 



Buckwheat Screenings. — Wheat 53-8 per cent, oats 1.2 per cent, 

 flax 7 -6 per cent, wild oats 1 -2 per cent, wild buckwheat 25 per cent' 

 lamb's quarters 3 - 1 per cent, wild mustard (30) 0-7 per cent, other 

 mustards 2-5 per cent (ball mustard 33, stinkweed 3, western false 

 flax 6, peppergrass 1, hare's-ear mustard 34, tumbling mustard 22) 

 other weed seeds, 1 per cent (stickseed 12, American dragonhead lo' 

 green foxtail 7, Russian thistle 6, cow cockle 6, Canada thistle s' 

 prairie sunflower 3, pigweed 2, lady's thumb 2, prairie rose 2, purple 

 cockle 1, catchfly 1, wild carrot 1, bull thistle 1, plantain 1) chaff 

 etc., 3-9 per cent. ^' ' 



Screenings, black seeds removed.— Wheat 51 per cent, oats 8-5 ner 

 cent, barley 1 per cent, flax 5 per cent, wild oats 6-4 per cent, wild 

 buckwheat 8-7 per cent, lamb's quarters 1 -5 per cent, mustards 1-5 

 per cent (wild mustard 25, ball mustard 17, hare's-ear mustard U 

 worm-seed mustard 1, tumbling mustard 11, peppergrass 2, false flax 

 1), otherweed seeds 0-7 per cent (western'rje grass 8, stickseed 6 

 Russian pigweed 4, American dragonhead 4, cinquefoil 2, wormwood 1 

 wolfberry 1, prairie rose 1, prairie sunflower 1, lady's thumb 1 green 

 foxtail 1, gumweed 1), chaff, etc., 15-7 per cent '^ " ^, green 



