APPENDIX 227 



VIII. LARGE VERSUS SMALL SEEDS AS CROP PRODUCERS 



Materials. One or two papers of some turnip-shaped variety of 

 radish seed. 



Directions. Prepare the ground carefully, sort the seeds into two 

 lots according to size, plant large seeds in one row and small ones 

 in another. The rows should be at least one foot apart and the 

 seeds one and one half inches apart in the row. Keep well culti- 

 vated and, when large enough, use for luncheon, observing whether 

 the large or the small seeds give the better results. 



IX. POTATO SCAB 



Materials. A dozen scabby potatoes, a small gunny sack, a ten- 

 quart pail containing about two gallons of water and one ounce 

 of formalin. 



Directions. Put half the potatoes in the sack, mix the formalin 

 and water, set the sack of potatoes in the formalin-water mixture, 

 and let it stand one and one half hours. 



Grow the treated and untreated potatoes side by side in the 

 school garden. Do not plant where potatoes have been raised the 

 past year, as the scab often remains in the ground over winter. 



X. STUDY OF GROWTH OF MOLDS, MILDEWS, AND BLIGHTS 



Materials. Cup, bread, potato or lemon. 



Directions. Saturate a piece of bread with water and keep it 

 under a cup in a warm place for a few days. Note the white, 

 fluffy fibers (mycelium) at the beginning ; later from these arise 

 other fibers which bear tiny, black bodies. Sometimes the ends* 

 appear green. These fibers act in much the same way as do those 

 which form the powdery mildew on the pear and grape leaves. 

 The tufts at the end of the delicate fibers contain spores, which 

 correspond to the seeds of other plants. Mold on the potato or 

 lemon can be observed in a like manner. 



