1). Hygroscopic salts. 



Experiment 43. Hygroscopic salts. 



PLANTS AND ANIMALS. VIII. 



48. A brief summary of the facts stated under the 

 same topics in the work for the fifth, sixth, and 



seventh grades. 



49. Acid soils. 



a. The cause. 



b. The remedy lime and rotation of crops. 



Experiment 44. Acid soils and liming. 



50. Practical forestry. (See Section 92.) 



51. The geography of animals. 



Experiment 45. Making animal charts. 



52. Fishes. 



Experiment 46. The balanced aquarium. 

 Experiment 47. Fishes need air. 



53. Man's place in nature. 



54. The mind, 



Experiment 48. The senses of taste, 

 smell, and touch. 



55. Sleep. 



a. The need. 



b. Dangers from using sleep producers. 



56. The nose and throat. 



a. Care. 



b. Adenoids. 



57. Yellow fever and malaria. 



a. Cause. 



b. Prevention. . ' 



