"Dr. Broadbent's introductory address at the opening of the session at Owen's College, Manchester, deserves more attention than most of these formal deliveries. He dwelt on the intellectual interest which attaches to the study of medical science, and illustrated it, among other ways, by the interest excited by recent observations on the action of bacilli and the combat which goes on between these invading hosts and the guardian cells or leucocytes of the living body. Inflammation surrounding a wound is regarded as caused by the influx and multiplication of leucocytes to engulf and destroy septic bacilli which have gained entrance from the air, a 'local war' of defence. The issue of this pitched battle will depend on the relative number and activity of the respective hosts. Inflammation round a poisoned wound is an evidence of vital power and a means of protecting the system at large from invasion and devastation. If this first line of defence is broken through, the bacilli pass through the lymphatic spaces and ducts to the glands, and another battle ensues which produces glandular swelling and inflammation and possibly abscess. This second line of defence may be insufficient and then we get general septicaemia. It is now well proven that the injury is done, not by the bacilli themselves but by the toxines which they secrete or excrete. Dr. Broadbent very properly points out that the action of the bacilli of fever in the body is strictly comparable to the action of yeast in a fermentable liquid. The yeast cells grow and multiply at the expense of the sugar, in destroying which they produce alcohol, carbonic dioxide and other substances. When the alcohol amounts to some 17 per cent. of the liquid the process is stopped by the poisonous action of the alcohol on the yeast cells. In just the same way the toxines produced by the bacilli at length stop their further multiplication and put an end to the disease. Alcohol is in fact, the toxine produced by yeast, and, like many other toxines, it is not only poisonous to cells which produce it, but to any animal into whose veins it may happen to get.