That's on the Dean, not the department, though. (Funding/College of Science) If the funds are not released then the departments cannot assume that there will be money for summer salaries (9 month appts means summer salaries for teaching) when they are setting the schedule back in the fall. To do otherwise would be fiscally irresponsible. If the funds are made available then extra sections can be taught if there are faculty to teach them. Any revenue made by a department for instruction goes to the College of Science not the department.