SUGGESTIONS ON LABORATORY WORK 
503 
mercial enterprise in which science is brought to bear 
at every point. Food and moisture requirements are 
considered; planting distances determined; habits of 
growth studied ; insect and fungous enemies combated 
and products harvested and prepared for market. 
The gardens should not be larger than can be properly 
cared for by the student in the time available for this 
work ; 20 x 50 feet is about right for a two-hour labora- 
FIG. IIO. COMPANION CROPPING IN A STUDENT GARDEN 
tory period weekly. Much of the work will be done at 
odd times by the students. This is important, because 
rainy weather or an excessive supply of soil moisture 
often prevents work at the scheduled hours. 
No allusion has been made in this chapter to the sys- 
tematic study of vegetables. The student gardens, how- 
ever, afford a large amount of excellent material for this 
work, but such study should be treated in a separate 
course, as indicated in the introductory remarks. 
