32 FIRST YEAR COURSE IN GENERAL SCIENCE 



(11) What is meant by "the catchment basin" of a reser- 

 voir? 



(12) What precautions are needed to keep the reservoir 

 water clean and harmless? 



(13) A community now uses about 8 million gallons a day, 

 which is more than its present system can supply in a dry 

 season. What must be the situation of a basin that would 

 furnish more water to be turned into the present distributing 

 reservoir? 



(14) How can water be safely transferred from one reser- 

 voir to the other? 



(15) Supposing a river or a mountain lay between the two 

 reservoirs, how could those obstacles be overcome? 



EXERCISE XXIV (Textbook 279) 

 THE WHEAT SEEDLING 



APPARATUS: A piece of clean blotting paper, colored 

 preferred; a plate or saucer; a tumbler; some wheat seeds, 

 morning glory seeds, or any other garden seeds of moderate 

 size. 



DIRECTIONS FOR WORK: Soak 20 seeds for 24 hours. 



(1) Make a drawing of a dry seed. 



(2) Make a drawing of the seed which changed the most 

 while soaking. 



(3) Select twelve of the most perfect seeds and place them 

 on damp blotting paper on a plate under an inverted tumbler. 

 If after a day or two the paper begins to look dry, put a 

 few drops of water on the corners and the moisture will 

 spread. The paper should be kept moist, not wet. Examine 

 and record observations from time to time. Do not remove 

 the tumbler. 



(4) Bring the paper with the seeds to school after five 

 days. 



