A correspondent this morning urges the establishment of a course in Common Law. The idea is, we think, excellent, and will meet the approbation of a very large number of students in college. Every man, especially he who intends to go into business, ought to know at least the elements of law; indeed it is a part, and a very essential part of a liberal education to have some insight, however slight, into the wokings of the legal machine, and there is no course in the Law School which is calculated to give this knowledge. Such a course should be comprehensive, but free from technicalities. Some of the law professors could deliver the lectures, and the expense therefore could not be very great. We earnestly hope that the authorities will consider the matter.