Under this designation are included tumours composed of typical lymphatic gland tissue. Such tumours originating in glands would be scarcely distinguishable from simple hypertrophies of these. It is doubtful whether such simple lymphomas exist. Enlargements of lymphatic glands occur as a result of tuberculosis and syphilis, and in leukaemia, but these all belong to distinct categories. The proper tumours arising in lymphatic glands and having their structure are nearly all infective or sarcomatous in character.