PROTOPLASM. 
Crush a wheat, oat or barley root-tip under the 
cover glass and study the loose cells of the root-cap 
under the high power. Note that they contain a grayish 
granular substance, protoplasm. In some cells you will 
find a small rounded mass of protoplasm. This rounded 
mass is called a nucleus. Run a few drops of strony 
iodin under the cover glass and after leaving it a few 
minutes replace it with water. What effect does iodin 
have on protoplasm; on the nucleus? Do you find a 
nucleus in every cell? 
Make an enlarged drawing of one of the cells and 
describe it. 
Cut thin cross sections of a young potato sprout, a 
stem. Do you find any protoplasm in the cells; any 
nuclei? Stain the sections with iodin as you did the root- 
caps. Are the cells entirely filled with protoplasm? If 
not, where is the protoplasm found; the nuclei? Do you 
find more than one nucleus in any of the cells? Drawa 
cell and describe. 
Take a small leaf of Eledea from a terminal bud and 
mount it in water. Study it under the low and high 
power and note that the leaf is composed of ceils which 
contain green bodies called chlcroplasts. Are the cells all 
the same in form? Compare those at the edge of the leaf 
with those in the middle, and with those between the mid- 
ie and the edge, with regard to form, size, thickness of 
cell walls, and number of chloroplasts they contain. Is 
