158 STATE BOARD OF AGRICULTUKE. 



REPORT OF THE BACTERIOLOdlCAL SECTION. 



Director R. S. Shaw, 



Dear Sir: 



Progress can be reported on every problem outline in our report of the 

 preceding year. No changes have been made in the projects as outlined in 

 that report. Research Assistant, Robert L. Twee,d, in charge of Adams la, 

 reports on his work as follows : 



During the past year one-third of my time (winter term) has been spent 

 teaching and two-thirds with technical research and work of a popular nature. 



Under project, Adams la, "The effect of diseases in the cow upon the milk", 

 I have under way experiments relating to the following phases of the problem 

 as applied to infectious aloortion. 



1. Studies upon the significance of high cellular counts from Bad. abortus 

 infected udders as compared with non-infected udders. 



2. A study of the teats as an avenue of Bad. abortus infection of the udder. 



3. Feeding experiments with Bad. abortus infected milk. 



4. Study of strains of Bad. abortus and abortus-like organisms isolated from 

 milk. 



5. Efforts to devise better methods for studying the presence of Bad. 

 abortus in the udcUn". 



Under my direction, also, graduate assistant, 0. H. Friedcman, has under 

 way "A study of the nature oi Bad. abortus infection of the udder" the results 

 of which he expects to sul)mit as a master's thesis. 



My work of a popular nature has consisted of bacteriological examination 

 of 26 fecal specimens, from as many different cases suffering from intestinal 

 disorders. In the majority of these cases a diet was recommended supple- 

 mented with some form of fermented milk. The laboratory has furnished 

 162 quarts of this milk with 75 per cent of the cases reporting beneficial results 

 from the fermented milk as part of the diet. 



I have also made 15 autogenous vaccines for the treatment of chronic bac- 

 terial infections, 6 complete blood counts, 2 blood cultures, 2 examinations 

 of human milk being used for infant feeding, and 5 examinations of milk for 

 the presence of Bad. tuberculosis. 



[Robert L. Tweed.] 



In the report of progress made by Research Associate Ruehle on Adams 

 project lb, I would call your attention in particular to the recommendations 

 relative to cooperation with the Sections of Chemistry and Dairy Hus- 

 bandry. From the standpoint of economy, efficiency and determination of 

 speedy results this co-operation is imperative. Mr. Ruehle's report follows: 



My time was devoted this j^ear to three lines of effort, namely, (1) teaching; 

 (2) work of a popular nature, and (3) research work on the "Keeping ciuality 

 of butter," (project, Adams lb). 



The work of a i)opular nature consisted in answering numerous letters of 

 inquiry relative to dairy hygiene, and inspection and analyses of the milk sup- 

 plies of East Lansing and the College . Several minor investigations were made 

 of the sanitary condition of various dairy products but nothing was found of 

 sufficient interest to warrant a description of the work. 



