On June 21, he inhaled 4 pints mixed with 30 of air, and felt a “greater lightness”—no increase of palpitation. After four days of treatment, he got an opportunity of spending a fortnight in the Highlands, and I recommended him to try the breathing of oxygen there. He returned home, however, in July, not so much improved as we had hoped, and still complaining much of soreness about the chest, and oppressed breathing. From this time to September he took an inhalation every third or fourth day, and with perceptible benefit. It is true that he took, for some weeks of the time, the hypophosphate of lime and cod oil, but still the effect of the inhalation in improving breathing power, and appetite especially, was immediate enough to convince us that it had a large share in his recovery. He has remained fairly well since. To resume: 12 cases are here related; 2 of the 12 are of organic, and in all probability incurable disease, and these 2 derived little or no benefit from the inhalation of oxygen; the other 10 found benefit as recorded, some more, some less, but all of a kind which I have not seen given by medicine alone. It remains to ask—Is there any common character by which we may connect together this series of cases, and which may enable us to say, oxygen is good for such and such a class of cases, as we say iodide of potassium or quinine is good for such and such a class? I think that we may find some such common character in the presence of congestion, especially venous congestion, whether of the liver, the lungs, or the uterus: more than this I will not say at present; the classification of carefully-observed cases, and a rational theory of this “modus medendi,” are points that require special study, and cannot be dogmatised upon until we have a wider basis of facts. ON THE HERPETIC FORM OF STRUMOUS OPHTHALMIA, AND ITS TREATMENT BY ARSENIC. BY ROBERT S. OGLESBY, _Assistant Demonstrator of Anatomy in the Leeds School of Medicine._ Strumous Ophthalmia, associated with herpes of the face, or as it may be termed the herpetic form of strumous ophthalmia, is a disease so often met with in general practice, and one so little amenable to local treatment, that I venture to say a few words regarding its treatment constitutionally. I should hesitate to occupy valuable time and space with what appears to be a trivial subject, on which much has already been written, did I not believe that by so doing additional light might be thrown upon the subject. For several years past I have been collecting evidence, carefully sifting and placing all well-marked cases aside for special treatment. The results obtained in the earlier batches of cases thus treated, decided me to continue such treatment for a lengthened period. The evidence thus obtained being highly satisfactory, other treatment formerly employed was abandoned.