the serum-agar mixture in several cases. Cultures were obtained in broth and in milk without coagulation, contrary to the statement of Preisz. No gas was produced in sugar broth. Nowak inoculated a number of pregnant laboratory animals, and produced abortion with great regularity in guinea pigs and rabbits by subcutaneous, intravenous and intraperitoneal injection. He did not succeed in producing abortion by intravaginal application nor by feeding. No tests were made upon larger animals much to his regret, as in his opinion the experiments of Bang upon cows still left something to be desired in the way of experimental evidence. McFadyean and Stockman (1909) have investigated the contagious abortion of cattle in Great Britain, and have found it to be identical with that studied by Bang in Denmark. They were able to produce the disease in cows by intravenous injection of natural virus and of active pure cultures, without a failure in eight experiments. By intravaginal application they caused the disease twice with cultures and three times with natural virus, but also failed to obtain any result in three trials with the natural virus. Subcutaneous inoculation was successful three times in five trials. By feeding they produced the disease three times in four trials. These authors consider ingestion to be an important mode of contracting contagious abortion in nature. Zwick (1910) has made a preliminary report of the bacteriological investigation of contagious abortion at the German Imperial Health Office. By a comparative study of cultures, the unity of the disease in Denmark, Germany, England, and Holland has been established. Certain individual differences were detected in the various culture strains examined, and it was found that the bacillus could be readily cultivated upon various ordinary laboratory media, and that it could also adapt itself to an aerobic existence, thus confirming the work of Nowak. In one instance the bacillus grew aerobically immediately upon isolation from the animal body. Abortion was induced in sheep, goats, and rabbits by intravenous injection, intravaginal application, and also by feeding. Work upon the use of abortin (analogous to tuberculin) for diagnosis, and upon the agglutination and complement fixation tests, was in progress at the time the report was made. BACTERIOLOGICAL OBSERVATIONS AND EXPERIMENTS AT THIS STATION