WHITE MUSTARD 



17 



germinate and grow for a week or more on damp flannel, and examine them 

 in various stages of development, noting the notched cotyledons with small 



C 



Fio. 5 —I- Seed of White Mustard, z. Folded embryo as seen after 

 removal of seed-coat. 3. The same unfolded. 4. Seed ger- 

 minating, s- Young seediing. 6. Same as s, but a week older. 



c Cotyledons or ' smooth leaves ' ; A hypocotyl ; r radicle and 

 primary root; /first foliage leaf ('^ rough leaf); ;* petiole 

 of another leaf similar to / with blade removed ; i terminal 

 bud ; X surface of the soil. 



plumule, well-marked hypocotyl, and distinct separation between the latter 

 and the root. 



B 



