participation, if the student is registered in a course that requires on the average 24 to 26 hours, he shall have completed 24 hours; if he is registered in a course that requires on the average 27 to 32 hours, he shall have completed 27 hours; if he is registered in a course that requires more than 32 hours, he shall have completed 28 semester hours. This section shall refer to credits during two semesters and a summer school immediately pre- vious to participation. Said summer school must precede or follow the second semester. : 3. Such work in summer school, correspondence and extension as is accepted by the members of the as- sociation may be counted toward eligibility. Cor- respondence courses, to be counted for eligibility, shall have been completed by the first day of class work of the term during which the athlete desires to participate. 4. Non-credit courses. A student who has met the entrance requirements of his college, but who is re- quired to take a non-credit subject, may count that subject toward the satisfaction of credit hour re- quirements. IV. RESIDENCE. 1. A Semester’s Residence. A semester of residence shall be defined as any semester in which the stu- dent has registered in the school and has partici- pated in athletics or has not withdrawn from school within four weeks from the date of, his regis- tration. 2. One Year’s Residence. No student shall be per- mitted to participate in intercollegiate athletics until one calendar year has elapsed since the time of his matriculation. He shall also have been in residence in his institution one full academic year. Summer sessions shall not be counted toward the year’s residence. Institutions on a regular quarterly basis shall count the last three quarters in residence as making up one year of required residence for 9