The infinitesimal dose of Homoeopathy is in no way inimical to the entrance of all the elements constituting a substance into its materia medica. The salts of potassium owe their effect to their base as well as to their acid; _Graphites_ is analogous to _Carbo_ and _Ferrum_, because it contains both carbon and iron; _Hepar sulphuris calcareum_ acts by reason of its sulphur as well as of its lime. _Bacillinum_, then, combines in its action all its constituent products, owing its efficacy to its suppurative microbes as well as its inclusion of Koch's bacillus. This method of viewing the matter, which is peculiar to myself, permits me to include in one and the same category the action of _Bacillinum_ in consumption and its action in non-tuberculous bronchitis. I have studied conscientiously the action of _Bacillinum_ in tuberculosis, and I must confess that I am looking out still for an authentic case of cure by this remedy. Nevertheless, in the midst of the paucity of drugs for the treatment of tuberculosis, I am happy to state that _Bacillinum_ has produced in my hands considerable amelioration of the symptoms of this disease. Perhaps in certain cases it produces what Bernheim would call "la treve tuberculeuse." But sooner or later the drug, after ameliorating the symptoms, loses its effect, and the disease again gets the upper hand. I wish I could be as optimistic as Dr. J. Compton Burnett in his interesting book, "A New Cure for Consumption;" but that is impossible. In looking over my observations I find that the symptom which has always undergone the greatest mitigation has been the _expectoration_. When _Bacillinum_ acts on tuberculosis the sputum is less abundant, less purulent, less green, and more a[=e]rated. It is this which has always struck me most in the action of _Bacillinum_. It is rarely that a patient satisfied with the remedy fails to remark, "I expectorate less." In cases of dry cough at the beginning of tuberculosis I have noticed that the drug evidently arrests the tubercular process. I would most severely criticise, as well for myself as for others, cases of so-called "cure of tuberculosis." There certainly are persons in whom the disease does not develop. These may have been accidentally infected, and their phagocytes may have struggled against their microbe foe. But in the case of an individual in whom the tubercle finds a suitable field for development, it is the merest chance that he entirely recovers without ulterior relapse; mostly it is a seeming cure, caused by a time of pause in the microbian pullulation.