•490 H. R. Seddon: 



(1) It gives a marked naked eye deposit (and lience is easily 



read), in a positive reaction; 



(2) Conversely, it gives a definitely cloudy appearance (and 



hence is easily read), in a tube where there is no agglu- 

 tination. 



(3) With the total volume of fluid in tlie tube anything from 



H to 20 c.c, the agglutuiation reaction is (.'omplete in 

 24 hours. 



(4) It is tlie minimum amount of ennilsion that will answer the 



above i-equirements. 



In conclusion, I wish to express my best tlianks to Professor H. 

 A. Woodruff, Director of the Institute, for permission to under- 

 take this work, and for much kindly help and advice. 



BIOGRAPHY. 



1. MacFadyean and Stockman (1909). Report of Dei.artmental 



Committee (Board of Agriculture, Ct. Britain), on Epizootic 

 Abortion, Part 1. 



2. Mohler and Traum (1913). Annual Report, Bureau of Animal 



Industry, Dept. of Agriculture, U.S.A., 1911, pp. 147-183. 



3. MacFadyean and Stockman (1912). Journal of Comparative 



Pathology and Therapeutics, Vol. XXV., 1912, pp. 22-29. 



4. McFarland, Journal American Medical Association, Vol. 49, p. 



1176. Extracted in Bulletin de L'Institut Pasteur, Vol. 6, 

 1908. p. 123. 



5. Hewlett (1914). Manual of Bacteriology, 5th Editi..n. p. 188. 



