June, 1939] Ageiclltural Research in X. H. 21 



sary for the collection and examination of individual quarter sam- 

 ples. The value and limitations of the various tests are discussed in 

 detail in a bulletin^ prepared during the year and now being dis- 

 tributed. 



In the laboratory studies 535 strains of streptococci have been 

 isolated from infected cows. Of these cultures, 87.7 per cent have 

 been identified as Streptococcus agalactiae. 



From the work done to date it appears that periodical laboratory 

 examination of samples and segregation with gradual replacement 

 of infected animals is necessary for the control of mastitis. C. L. 

 Martin has been using vaccines, prontyln and prontosil ; but the data 

 so far secured indicate that none of these methods are effective. An 

 inducto-therm, a short wave-producing machine which causes heat 

 to penetrate deeply into tissues, was also used at the university dairy 

 barn on three different animals which had the chronic form of mas- 

 titis, but the treatment did not prove beneficial. 



This work will continue with other treatments being tried and par- 

 ticular attention paid to the prevention and control of the spread of 

 mastitis through segregation of infected animals and sanitary 

 measures. (Pu7-neU Fund) 



Bang's Disease Testing 



With 47,124 Federal samples, 1,190 New Hampshire private sam- 

 ples and 1,697 out-of-state samples taken, the total number tested 

 for Bang's disease during 1937-1938 was 50,011, as compared to 

 22,026 for the previous year. The tests were in charge of C. L. 

 Martin. {Miscellaneous Income) 

 Electrical Washing and Sterilizing Equipment for Dairy Utensils 



New devices offered for sale by manufacturers are tested for 

 efficiency, labor-saving qualities, equipment and operating costs and 

 degree of sterilizing action obtained. Work on this project in charge 

 of W. T. Ackerman was interrupted in the summer of 1937 by fire 

 which destroyed most departmental facilities, but has now been 

 resumed. {Bankhead-J ones Offset Fund) 



State Rural Electrification 



This service, conducted by W. T. Ackerman, is used as the demand 

 arises. Many conferences have been held with farmers on proposed 

 lines. Two line extensions were made which required four meetings. 

 The work is carried on in cooperation with the State Rural Electri- 

 fication Committee, the Public Service Commission and other 

 organizations. {Bankhead-J ones Offset Fund) 



Testing Farm Equipment 



W. T. Ackerman and G. M. Foulkrod made laboratory and, when 

 necessary, field tests of equipment, principally electrical, in order to 

 inform cooperative farm organizations and rural service depart- 

 ments of utility companies on the desirability or undesirability of 

 merchandising equipment, the value of which to the consumer has 

 not been satisfactorily determined. Although the project has been 



iSlanetz, L. W. and Naghski, J; Methods for the Diagnosis and Control of 

 Bovine Mastitis; New Hampshire Agricultural Experiment Station, Technical 

 Bulletin 72, February, 1939. 



