MIDDLEBURY — Middlebury College next week will hold a symposium to discuss the college’s endowment policies and practices. The 90-minute panel, to be held on Jan. 22 at 7:30 p.m. in the McCullough Social Space, is to be the first in a series of talks about the endowment to address the possibility of reinvesting elsewhere the $32 million of the endowment that is currently invested in fossil fuel companies.