b. Advantages of each method. 



Experiment 52. Slipping, budding, and 

 grafting. 



49. Pruning. 



a. Method. 



b. Advantages. 



50. Plants which live upon other plants or upon 



animals. 



a. The kinds bacteria, yeasts, molds, blights, 

 mildews, smuts, rusts, scale, toadstools, and 

 mushrooms. 



b. Their dangers and their prevention. 

 Experiment 53. The growth of bacteria. 



51. Bacteria harmful and helpful. 



Experiment 54. Acid fermentation, 



52. Mushrooms and Toadstools. 



a. Mushrooms as food. 



b. The dangers from toadstools. 



53. Insects. 



a. Useful and harmful. 



Experiment 55. (A continuous experi- 

 ment.) To make a collection of insects, 



b. Pests and their control. 



54. The silk worm. 



a. The worm. 



Experiment 56. How to raise silk 

 worms. 



b. The product. 



55. Flies. 



a. The dangers from flies. 



b. Their prevention. 

 56.' Mosquitoes. 



a. The danger from their bites. 



b. Their prevention. 



Experiment 57. (A continuous expert- 



