The fourth and fifth of the series of free public lectures offered by the Faculty of Medicine will be given at the Medical School, Longwood avenue, Boston, this evening at 8 and tomorrow afternoon at 4 o'clock. Today's lecture will be given by Dr. C. J. Blake, M. '65, whose subject will be "Auditory Vertigo: Deafness Due to Ear Disease." The lecture tomorrow afternoon will be given by Dr. W. T. Councilman h. '99 on the subject of "inflammation."