=Adenoma= of the Fallopian tube is a rare disease; but a few cases have been described in medical records. The presence of primary adenoma in the Fallopian tube is strong proof of the glandular character of the mucous membrane--an anatomical point which, as has already been said, has been denied by some writers. In adenoma the tube becomes distended with the typical adenomatous mass, which may protrude from the abdominal ostium. In some of the reported cases there has been found a considerable quantity of free fluid in the peritoneum, though the peritoneum itself was not diseased. It seems probable that this secretion originated in the tube and escaped at the ostium. =Myoma.=--Notwithstanding the frequency of myomatous tumors of the uterus, the condition is exceedingly rare in the Fallopian tubes. The tumors originate in the muscular coat, and are usually so small as to create no disturbance. =Cancer.=--Primary cancer of the Fallopian tubes is an extremely rare disease. A very few isolated cases have been reported. Cancer of the tubes secondary to cancer of the body of the uterus occurs more frequently. =Sarcoma= of the tube is a very rare disease. =Actinomycosis= of the Fallopian tubes has been described. =Syphilitic gummata= occasionally attack the Fallopian tube in women who are the victims of constitutional syphilis. The diagnosis of these unusual lesions of the Fallopian tubes is impossible with our present knowledge. The conditions have usually been found post-mortem or have been unexpectedly discovered at operation. The subjective symptoms throw no light upon the subject of differential diagnosis. Examination reveals merely a tubal tumor. As the rule is to operate in all cases of tubal tumor, the proper treatment will probably be applied, notwithstanding the uncertainty or mistake of diagnosis. CHAPTER XXVI. TUBAL PREGNANCY. Tubal pregnancy occurs when a fecundated ovum is developed in the Fallopian tube. Fecundation may take place in the Fallopian tube, because spermatozoa may pass through the uterus and the tube into the pelvic cavity; but unless something occurs to arrest the passage of the fertilized ovum into the uterus, a normal uterine pregnancy will result. It is said by Webster that predisposition to tubal pregnancy is due to a “developmental fault, whereby there is reversion, either of structure or reaction tendency, in the tubal mucosa to an earlier type in mammalian evolution.” In other words, decidual changes, following the fertilization of the ovum, may in some women occur in the mucous membrane of the Fallopian tubes as well as in that of the uterus. If this condition is present in any case, and at the same time something occurs to impede the passage of the ovum into the uterus, a tubal pregnancy may take place.