The cardiac manifestations of acute rheumatism which may be grouped under the term "rheumatic carditis'' are the most frequent and dangerous of rheumatic manifestations. While this is true of all periods of life, it especially applies to children and early life, particularly that period preceding the fifteenth year. I do not propose to enter into a discussion of all the phases of cardiac rheumatism, but rather to direct attention to a few points of special interest in connection with rheumatic lesions of the pericardium, myocardium and endocardium.
—Considering these structures with reference to the frequency of their involvement in acute rheumatism, we find that endocarditis is much more frequently associated with acute rheumatism than is any other cardiac lesion. We think, however, that a close study of the clinical history and morbid anatomy of this subject will show that endocarditis has been credited, in this connection, with much that