TESTES: The testes seldom presented gross alterations of structure except for abscess formation, which, according to Williams, occurs more frequently in the bull than in any of the other domesticated animals. He also states that arrest in development by which the organs remain soft, flaccid, and somewhat smaller than normal is not uncommon. One very interesting specimen, which typifies abscess formation, came from a bull with a history revealing that one testis had become much enlarged, hot, and painful. These symptoms developed very rapidly. Anorexia was well marked. Local applications were used for several weeks, but at the end of two months the condition was so little improved that unilateral castration was performed. The general condition of the animal soon improved, but after a year of service he was so uncertain compared to what he had been, that he was sent to the butcher. It was impossible to obtain the other testicle for study, though it undoubtedly was abnormal. The testicle removed was considerably enlarged, measuring twenty by ten and one-half centimeters. The tunica albuginea presented a thickness of six millimeters, and was made up of firm sclerotic tissue. The epididymis was not recognizable in the mass. Testicular tissue was almost entirely gone. The only remains, of what appeared to have been parenchyma, was an elongated irregular area at one side of the organ. This tissue consisted of a whitish opalescent material, speckled with varying sized abscesses. This organ is pictured in Fig. 3. The remainder of the organ consisted of a thick yellowish caseous mass. _Streptococcus viridans_ was recovered from the outer portion of the organ, and guinea pig inoculations failed to demonstrate _Bact. abortum_.