878 kxpkhiment .station kFa:!ORu. iw.i. 4i 



aud inoculating each Lube wilh li. tctanl and evacualiug as before. The 

 strength of the tuberculin can be calcidated from the amount used in the first 

 tube in which no growth takes place. 



II. Detenuination of the antitoxic power of untituherculous serums (pp. 823, 

 824). — Using the method noted above for determining the strength of tubercu- 

 lin, it was found that noi-mal and antituberculous serums in general neutralize 

 tuberculin to the same degree, but that occasionally the normal serum has a 

 stronger neutralizing power than the specific serum. Three theories are sug- 

 gested to account for this: (1) The antituberculous serum may contain free 

 tuberculin, (2) the organism of immunized animals is weakened by injections 

 of tuberculous cultures and no longer has the power of forming the same 

 quantity of diastases as do normal animals, and (3) the organism under the 

 prolonged toxic action of tuberculous cultures produces substances which have 

 the property of weakening the diastases which attack and transform tuberculin. 



III. [Contparisoii of human, bovine, and equine tubercle bacilli] (pp. 881, 832) . — 

 The amount of tubei'culin in cultures of human and bovine tubercle bacilli was 

 found by the tetanus bacillus test to be greater than that in cultures of the corre- 

 sponding equine bacilli. The repeated passage of the equine bacilli through 

 rabbits renders it as virulent and of as high a tuberculin content as human and 

 bovine tubercle bacilli. 



The author concludes that the tuberculin strength is always proportional to 

 the virulence of the tubercle bacilli, and that human, bovine, and equine tubercle 

 bacilli do not constitute different races of bacilli but different species of bacilli 

 belonging to the same race. 



Methods of detecting tuberculosis in cattle, J. J. Lintner (Creamery and 

 Milk Plant Mo., 8 (1919), No, 5, pp. 36, 37). 



Accredited herds, F. Toreance (Agr. Gaz. Canada, 6 (1919), No. 11, pp. 958, 

 9.5If). — The author presents regulations for the establishment and maintenance 

 of tuberculosis-free accredited herds of cattle as fixed by an Order in Council 

 dated September 20, 1919. 



Bovine " aphticelle," Bedel (Rev. G&n. MM. Y^t., 28. (1919), No. 325, pp. 

 12-17). — The author describes an affection of cattle from the evacuated district 

 of France which differs from foot-and-mouth disease and is thought to represent 

 a new disease. 



Cattle fever ticks and methods of eradication, W. P. Ellenberger and R. M. 

 Chapin (U. S. Dept. Ayr., Farmers' Bui. 1057 (1919), pp. 32, figs. 5).— The first 

 part of this publication (pp. 3-21), which deals \\"ith tick eradication, its 

 progress and importance, life history of the tick, and methods of eradication, is 

 based uiwn Farmers' Bulletin 498 by Graybill (E. S. R., 27, p. 579) and Bureau 

 of Animal Industry Circular 207 by Graybill and Ellenberger (E. S. R., 28, 

 p. 181), which it supersedes. The second part (pp. 21-32) contains information 

 on ar.senical dips by Chapin, and supersedes Farmers' Bulletin 603 (E. S. R., 31, 

 p. 776) by the same author. 



An epizootic caused by trypanosomes in cattle in French Guiana, M. Leger 

 and M. Vienne (Dul. Soc. Path. Exot., 12 (1919), No. 5, pp. 258-266; abs. in Rev. 

 Appl. Ent., Her. B., 7 (1919), No. 9, p. iJ7).— The authors conclude that the 

 trypanosome which infects cattle in the natural state, and cattle only, in French 

 Guiana, is a new species for which the name Trypanosoma' guyanense is 

 I)roposed. 



On the life history of the lungwonn, Dictyocaulus filaria, in sheep, J. E. 

 GuBERhET (Jour. Amer. Vet. Med. Assoc, 55 (1919), No. 6, pp. ff21-627) .—This 

 is a preliminary report of investigations conducted at the Oklahoma Experi- 

 ment Station, in which the present status of knowledge of the parasite is 

 reviewed. 



