PLATE 18 
A. —Germination of the untreated wheat illustrated in Plate 17: 1, harvester- 
thrashed seed, germination 90 per cent; 2, same seed after scouring, germination 46 
per cent, and showing growth of Penicillium and Rhizopus which gained entrance 
through the scratched and broken seed coats. 
B. —Relation of seed-coat injury to destruction of damp, stored, untreated wheat 
by molds, the seeds having been sprinkled with spores and stored for 10 weeks m 
bottles in a damp chamber: 1, seed coats unbroken; 2, seed coats broken over endo¬ 
sperm; 3, seed coats unbroken but seeds previously killed by boiling; 4, seed coats 
broken over embryo. 
