[14] 103 FLOWERING PLANTS 



Reserve food materials in seeds and tubers. 



I. CASTOR OIL SEED. 



Examine sections of the endosperm and observe the aleurone grains of reserve proteid in the cells. Oil is 

 also present in very minute drops. 



II. BEAN. 



Examine sections of the cotyledon and observe the reserve starch-grains surrounded by fine granules of 

 proteid in the cells. 



III. TUBER OF POTATO (Solatium tuberosum). 



Examine a small section of a Potato including the brown skin and a little of the internal tissue ; stain with 

 Schulze's solution and mount. Sketch a portion of the section to shew the cork cells of the skin, and the darkly 

 stained starch-grains in the large parenchymatous cells of the internal tissue. "* 



