THE STEM AND BOOT. 177 



BULB. A mass of thickened, scale-like leaves, 

 growing from a flat or conical solid base, from the 

 under side of which, roots are given off (Figs. 

 288, 289). 



RHIZO'MA. A stem more or less covered by the 

 soil, which gives off buds above, and roots below, as 



seen in Fig. 290. 



FIG. 290. 



Point out the root and the stem of an onion ? 



Is the bulb a stem or root ? 



Examine a growing hyacinth, and find the root 

 and the stem. 



"Which is the root and which the stem in a lily ? 



Look for sweet-flag, blue-flag, peppermint, knot- 

 grass, Solomon's-seal, and try the stem-schedule as 

 before, upon their entire underground portions. You 

 will find flag in marshes and by the water's side ; 

 Solomon's-seal, trillium, artichoke, etc., in meadows 

 and old gardens. If you cannot at once get abundant 

 specimens illustrating this exercise, put it off till you 

 have an opportunity to gather a good variety of such 

 plants as are here named. 



