Representatives of 16 undergraduate organizations preface fall membership drives with a mass meeting at 7:30 o' clock tonight in Phillips Brooks House where the why and wherefores of college extracurricular activities will be explained in detail to incoming students.

University political organization, as well as literary, outing, and service groups will make bids for new members. A Liberal Union official, representatives of The CRIMSON, Lampoon, Advocate and other college publications, spokesmen of the University band and of other activities will all lay their cards on the table.

Announcement of the re-opening of the Brooks House Library was also made yesterday by Lipton, who disclosed that books for many college courses are contained in the PHB collection. Open daily except Sunday from 9 a.m. to 5 p.m., the library will be supported by a $.25 "use fee" collected from each man taking books. A $.25 deposit, which is returnable, will be charged on each volume.