204 APPENDIX. 



ii. Examine the "eyes" of a potato, noticing that 

 here two or three buds may occur in the axil of the scale 

 leaf. Sketch a single " eye." 



Cut the potato and examine under a high power a drop 

 of the juice, which is turbid from the presence of numerous 

 starch grains. Sketch a single starch grain showing its 

 stratification. Let a small drop of iodine run under the 

 coverslip and notice that the starch grains turn blue or 

 blue-black. 



A series of potatoes should be examined to show that 

 one, two, or more shoots may arise from each eye. 



Make a sketch of a seedling potato to show that the 

 tubers are swellings of branches which arise above the 

 cotyledons. 



IV. Bulb. 



Cut a Tulip bulb in half longitudinally. Show on 

 your sketch of one half 



a. the short stem ; 



b. the fleshy scales acting as storehouses of nutritive 

 matter ; 



c. foliage leaves (of next year's plant) ; 



d. the flower ; 



e. your preparation may also show a small bud near 

 the flower stalk, which during the year would have de- 

 veloped into the following year's bulb. 



[Bulbs of various ages should be examined: for instance, 

 some while the tulips are still flowering, and others in 

 the autumn.] 



