76 



Elementary Work in Botany. 



cut so as to show the growing embryo lying in one end. 

 In the same figure is represented a radish pod, laid open so 

 as to show three of the seeds, two of which exhibit their 

 partly grown embryos.* Below, at b, is one of these mag- 

 nified, and at a an older one, also magnified. The grown 



embryo completely fills the seed. 

 Observe the positions of the em- 

 bryos in relation to the stems of 

 the seeds and the stems of the 

 pods. The lower seed in the radish 

 is fastened to the lower side of the 

 pod, the middle seed grows to the 

 upper side. The cotyledons in- 

 crease much more in size than the 

 caulicle. The embryo evidently 

 grows, in part at least, by absorb- 

 ing the liquid around it. Suppose 

 the embryo of the lupine to quit 

 Fig. 55. growing at the size represented in 



the figure, and that the liquid around it thickens until it 

 becomes solid. Would not the seed thus formed be 

 endospermic ? 



Take the pods which you have brought and study them 

 as indicated in the preceding paragraph. 



Get many kinds of flowers for the next exercise. 



* These are cut in two. The embryo may be seen through the seed-coat, as 

 represented at 3, by holding it up to the light. Half of the seed-coat is removed 

 from a. 



