VETERINARY MEDICINE. 775 



sists siiiiply in providiuj^ all catth' l):iriis with glass roofs in order to expose 

 lliein to the action ot the sun. 



The relation of tuberculous lesions to the mode of infection, K. C. 

 ScHROEDKK aiid W. E. Cotton {U. »S'. Dept. Affr.. Bur. Anim. Indus. Bui. 93, pp. 

 1!)). — The experiments reported in this bulletin were carried out chiefly to 

 ol)tain evidence as to the susceptibility of the lungs to infection with tubercle 

 liacilli without regard to the point of inoculation. The work was in continua- 

 tion of similar investigations already reported (E. S. U., 18, pp. 82, 378). 



In these exi)ei'iments '■'> hogs and 2 calves were given sul)cutaneous injec- 

 tions of virulent tubercle bacilli in the tip of the tail. This point was selected 

 as being farthest I'cmoved from the lungs. A study of these cases showed that- 

 the tubercle bacilli were taken up either by the capillary blood vessels or by the 

 ]\niii]ialic system and were carried to the lungs, which became excessively 

 diseased in all cases, while the inguinal glands, liver, and spleen were affec-ted 

 to a less extent. 



It appears, therefore, that the inhalation theory, to explain the frequent 

 infection of the lungs in tuberculosis, is becoming more and more unsatisfac- 

 lory, and more evidence is being accumulated for the belief that tuberculous 

 infection reaches the lung as well as other organs through tubercle bacilli 

 taken with the food. These conclusions are believed to apply both to animals 

 and man. 



Tubercular infection, W. T. I). Broad {Vet. Rec, 19 (1906), No. 9')5, p. 252).— 

 The author raises an objection to the frequent statement that direct experi- 

 ments in the transmission of tuberculosis from animals to man are impossible. 

 He argues that many instances are known where such transmission has taken 

 place through the agency of milk and considers the evidence in some of these 

 cases as very conclusive. One instance is cited. 



The investigations of Dammann and Miissemeier on the relation between 

 human and bovine tuberculosis, H. Kossel {Ccnthl. Bakt. [e^c.J, 1. AM., Oriy.. 

 1,2 (1906), Xo.s. 5, pp. JiOl-.'iOr,: 6, pp. .^S.9-49.5).— The author reviews in a critical 

 manner the experimental data and the conclusions drawn from them in the 

 investigations of Dannuann and Miissemeier. 



It is believed that the conclusicms as to the unity of tubercl(> bacilli rest upon 

 the assumed impossibility of determining constant morphological differences 

 between tubercle bacilli obtained from different sources and also upon the 

 apparent similarity of different races of bacilli in so far as pathogenic action is 

 concerned. The author argues that these facts are not demonstrated and that, 

 therefore, the conclusions as to unity of the different races of bacilli should not 

 be drawn. 



Tubercle bacilli in the apparently unaltered lymph glands of tuberculous 

 animals, .1. Swlirstka (Ziachr. I'lcisclt u. Milchhijfj.. 17 (1906), Xo. 2. pp. 

 27--'i2). — In the investigations reported by the author guinea pigs, rabbits, 

 goats, pigs, and calves were used as experimental animals. A careful exami- 

 nation was made of apparently normal lymph glands in these animals after 

 they had been infected with tuberculosis, the animals being inoculated with 

 material from the glands of hogs to determine the presence or absence of 

 tubercle bacilli. Positive results were obtained for tubercle bacilli in 7 cattle 

 and 2 hogs, while negative results were obtained in the case of 11 cattle and 

 •; hogs. 



As a result of this study, the author recommends the sterilization of the 

 meat in all cases of tuberculosis in which great emaciation is seen, in all cases 

 with extensive softened foci, in cases showing a recent blood infection, and in 

 tuberculosis of the bones. 



