STRUCTURE 5 
pulling up the plants. Record the results of your study 
by writing a paragraph on each variety of seeds studied. 
Four-o’clock. (Mirabilis.) 
Thoroly study Four-o’clock seeds externally. Do 
you find a hilum. micropyle, and chalaza? Carefuily 
remove the hard covering (testa) from a soaked seed. 
What are its characteristics? Do you find an endo- 
pleura’) di so,.describe.’ Note the leat-hke structure, a 
cotyledon forming a partial outer coat of the embryo. 
Remove it carefully. Do you find other cotyledons, a 
radicle, a plumule? Occupying the central portion of 
the seed is a white mass of substance called endosperm. 
After you have carefully worked out the form, size, color, 
structure, and interrelations of the different parts of the 
seed, demonstrate the results of your study to the in- 
structor. No notes on the Four-oclock seed will be 
required. 
Cut an entire seed, which has been soaked, cross- 
wise near the middle, and draw it as seen from the cut 
surface (x4). Remove the testa from another seed, cut 
it lengthwise thru the radicle, and draw as seen fram 
the cut surface (x4). Read Gray’s Lessons of Botany, 
pages 22-20. 
Indian Corn. (Zea Maize.) 
Carefully study, several kernels, of ‘corn, dry, and 
describe one. On the material table you will find some 
corn which has been soaked two or three days. Remove 
the outer coat from a kernel. This coat is really. com- 
posed of two coats very closely united. The inner is the 
testa, the outer is known as the pericarp. Describe. 
