1917] VETERINARY MEDICINE. 383 



or completely recovered from a severe attack of infectious arthritis. Owing to 

 the fact that we were unable to try the vaccine on a large number of animals 

 txperimentally, we hesitate to base our conclusions too strongly on results 

 obtained, and they should be confirmed." 



Tabulated data of complement-fixation tests and complement-fixation, ag- 

 glutination, and ophthalmic reactions, together with some other data, are 

 j-ubmitted. 



Bacillary white diarrhea of young chicks. — VI, Second progress report on 

 the elimination of infected breeding stock, L. F. Rettger, W. F. Kirkpatrick, 

 and R. E. Jones {Connecticut Storrs Sta. Bui. 88 (1916), pp. 247-254).— A. brief 

 summary is first given of the more significant data obtained in a systematic 

 campaign against bacillary white diarrhea in Connecticut, inaugurated in 

 June, 1914, a detailed report on the methods and results of which for the first 

 year has been previously noted (E. S. R., 35, p. 184). 



During the second year (1915-16), in which the agglutination test was 

 applied to 7,799 fowls in 78 flocks, of which 25 flocks failed to react and were 

 regarded as free from ovarian infection, the average percentage of infection 

 was 8.2 as compared with 10.24 for the previous year. As before, ovarian 

 infection was again less prevalent in the White Leghorn than in the heavier 

 breeds, only 3.4 per cent of 2,870 Leghorns examined being infected while the 

 average for 3,178 Plymouth Rocks, Wyandottes, and Rhode Island Reds was 

 11.45, and for a single lot of Orpingtons 31.7 per cent. 



While the elimination of reacting hens from breeding stock has a far-reach- 

 ing influence on the health and condition of the future chicks the work has 

 shown that a single set of agglutination tests and the elimination of reactors 

 is not an absolute guaranty that the flock is entirely rid of ovarian infection. 

 Single tests have, however, on numerous occasions sufficed to stamp out com- 

 pletely the infection from the breeding stock and the results thus far obtained 

 are said to have been very gratifying. Many tested and nonreacting flocks of 

 almost all breeds have been located in the State, so that buyers of eggs for 

 hatching and day-old chicks should have no trouble in procuring stock which 

 has a thoroughly clean known record. 



A simplification of the technique employed in testing has made possible the 

 reduction of the cost of the agglutination test in all but small flocks. Instead 

 of making two transfers of the blood serum as was formerly done, 0.03 cc. of 

 the serum in the original blood tube is introduced directly into 3 cc. of the test 

 blood in which the final observations are made.. 



A summary of the work of the first two years of the campaign shows that 

 9.3 per cent of 21,317 hens and 2.1 per cent of 1,037 males tested were found 

 infected. 



Enterohepatitis or blackhead in turkeys, C H. Higgins {Jour. Amer. Assoc. 

 Instr. and Invest. Poultry Hush., 3 {1917), No. 8, pp. 57, 58).— The data here 

 presented have been substantially noted from another source (E. S. R., 36, p. 

 384). 



Some field experiments bearing on the transmission of blackhead in tur- 

 keys, T. Smith {Jour. Expt. Med., 25 {1917), No. 3, pp. 405-414).— The author's 

 experiments show that healthy turkeys may be raised from the eggs of in- 

 fected flocks when all older turkeys and poultry ai-e kept away and the ground 

 has not been u.sed before, there being no evidence favoring the theory that the 

 protozoan parasite can be transmitted in the egg. In these experiments all 

 the turkeys remained well until August 14, the end of the hen exposure test, 

 when they were 12 weeks and 4 days old. The first death occurred 2 weeks 

 after the beginning of exposure to actual disease, when they were more than 



