SUGGESTIONS ON LABORATORY WORK 
501 
Chapter VIII, Irrigation. — Study the overhead sys- 
tem of irrigation, its parts and operation. 
Chapter IX, Insect Enemies and Diseases. — (1) 
Study the various types of nozzles, pumps, and dusters. 
(2) Prepare spraying and dusting mixtures, unless this 
experience has been gained in previous courses. (3) 
Make the necessary applications for the control of in- 
sects or diseases in the assigned plats. 
Chapter X, Seeds and Seed Growing. — (1) If the 
course is offered in the fall, there will be abundant op- 
fig. 109. students preparing soil and planting, 
the Pennsylvania state college 
portunity for the selection, harvesting, cleaning and cur- 
ing of seeds. (2) Make germination tests of old and new 
seeds. 
Chapters XI, XII, and XIII, Construction of Hot- 
beds, Cold Frames, and Greenhouses. — (1) Practice in 
painting and glazing hotbed sash. (2) Construct frames 
(3) Select and prepare the manure and fill the hotbed 
pit. (4) Observe propagating greenhouse for plant 
growing and its value. 
