250 STATE BOARD OF AGRICULTURE. 



kiiowlodj'e my iiicieji.siu}' indebtedness t<» Iiim fur liis loyalty and sup- 

 port. His leport follows: 



One third of ui}- time dnriug the past year has been given to work of 

 a popular nature. 



Much time has been taken up by the examination of a large number 

 of samples of milk which have been submitted to the laboratory for ex- 

 amination, and to correspondence with dairymen along the lines of dairy 

 hygiene. 



One third of m^- time has been given to technical research, (Adams). I 

 have continued my studies on the effect of diseases in the cow on the 

 milk with special reference to infectious abortion. Facts which have 

 developed in the course of this work are embodied in the following 

 ])ai)ers and published articles: 



Studies in Infectious Abortion in Cattle. 



By Ward Giltner, E. T. Hallman and L. H. Cooledge. 



Presented at the meeting of the American Veterinary Medical Asso- 

 ciation. >>ection on Sanitary Science and Police, Oakland Cali- 

 fornia, Sept, 1915. Published in Journal of American Veterinary 

 Medical Association, June, lOlG. 



The Pathogenic and Antigenic Properties of Bact. Abortus (Bang). 

 By Ward Giltner and L. H. Cooledge. 



Presented at the May meeting of the American Association of 

 Pathologists and Bacteriologists, Washington, D. C. Presented 

 by Dr. Giltner. 



The Agglutination Test as a Means of Studying the Presence of Bact. 

 Abortus (Bang) in Milk. 



By L. H. Cooledge. Presented at the Meeting of the Michigan 

 Academy of Science. Published in the Journal of Agricultural Re- 

 search, Vol. 5, No. 19. 



Further Studies on the Presence and Significance of the Aggluttinins 



for Bact. abortus (Bang) in Cows' Milk. 



Presented at the Meeting of the Society of American Bacteriolo- 

 gists at Urbana, 111., December, 1915. " Abstracted in Journal of 

 Bacteriology, Vol. I, No. 1, January, 1916. 



Is Bact. abortus (Bang) Pathogenic for the Human? 

 By L. H. Cooledge. 

 Published in the Journal of Medical Research, Vol. XXXIV, No. 3. 



The following summary of the work reported on in the above papers is 

 given as an indication of progress : 



A pure culture of Bacteriimi ahortus introduced into the milk cistern 

 of a cow's udder caused the appearance of agglutinins in the milk. 



In every case in which Bact. abortus was found present in the milk 

 by animal inoculation the agglutinins for this organism were also found, 

 but this bacterium was not found in every case in which agglutinins 

 were demonstrated. It is not known, however, w^hether the bacteria were 

 not found because of their absence or because of their presence in such 

 small numbers. 



