The fifth lecture in the series of 12 being offered by the Medical School every Sunday afternoon until March 23 will be given by Dr. W. D. Sutliff, assistant in Medicine at the Harvard Medical School. The subject of the address, which will be delivered at 4 o'clock at the Medical School, Longwood Avenue, Boston, will be "Pneumonia".

Dr. Sutliff first will present the problem, which he describes as follows: "The newer studies of lobar pneumonia have demonstrated something of the chemical constitution of the bacterium known as the pneumococcus which causes the disease. The organism consists of a proteim center and a capsule or outer coat that contains a carbohydrate. Although the pneumococci are otherwise very similar they differ in the exact composition in their capsules. It is possible to differentiate promptly 22 fairly common varieties that may cause the disease, lobar pneumonia."

In the closing part of his talk Dr. Sutliff will discuss research work that has been accomplished in the treatment of this form of disease and will describe the practical methods employed by Boston hospitals. He will devote some attention to the advance of treatments using anti-serum.

The next Medical School Lecture, which will be given by Dr. H. A. Kent on February 9, will deal with the subject, "Mouth Health". Subsequent lectures will take place on February 16, 23, March 2, 9, 16, and 23.