9 8 SCIENTIFIC AGRICULTURE. 



34. What is sulphur? What does it form in burning? Its 

 use ? What is sulphuric acid ? What are its compounds 

 called? Give examples. 



35. What is phosphorus ? Where found ? Why must it be 

 kept under water? Its use ? How does a match burn? 



36. What is phosphoric acid ? What is calcium phosphate ? 

 What does it form ? Why must soil contain phosphorus ? 

 How can it be supplied ? 



37. What is chlorine ? What is hydrochloric acid ? How 

 is chlorine separated ? Its properties? Uses? Where found? 



38. What is iodine ? Bromine? To what are they similar ? 

 Properties of fluorine ? Where found ? 



39. What is potassium? How kept? Why? What effect 

 has water on it ? What is caustic potash ? What do all acids 

 contain ? How are salts of potassium formed ? Where found ? 



40. Describe sodium. How does it act on water ? What 

 is common salt ? Where found ? In what respects are caustic 

 potash and soda similar to ammonia ? Their use ? 



41. Describe calcium ? Lime ? What are marble, lime- 

 stone, and chalk ? How changed to lime ? What is gypsum "t 



42. Describe magnesium and aluminum. Where found ? 

 What are its properties ? 



43. Ores of iron ? For what purpose used ? Where is iron 

 found ? What is said about manganese ? 



44. How is the composition of a soil generally given ? Is 

 it easy to analyze a soil ? 



45. What constituent exists in the largest proportion in the 

 analysis given ? What in the smallest ? 



46. How much organic matter is found in soils ? What ele- 

 ments are likely to be deficient ? 



47. How may soils be classified ? 



48. What are calcareous soils ? Peaty ? Heavy ? Light ? 



49. How deep is the soil generally ? What is the sub-soil I 

 How may the depth of soil be increased ? Its advantages ? 



