30 



N. H. EXPERIMENT STATION 



[Bulletin 319 



yields in the cultures grown at 19' C. but 80-100 parts per million 

 gave the highest yields in the cultures grown at 14° C. 



(Purnell Fwid) 



The Effect of Position in the Bin and Temperature Differentials on 

 Loss of Weight of Potatoes in Storage 



Three types of bins of the same cubical content were used by O. 

 R. Butler and P. T. Blood and the air intakes and ventilation flues 

 were similar in size in all three bins. The bins differed only in the 

 manner in which the air intake was distrilnited. In one bin (bin C) 

 the air intake opened onto the floor of the bin ; in another bin (bin 

 B) it opened into a conduit with slatted cover that ran down the 

 middle of the bin for its entire length ; and in the third type (bin A) 

 the air intake opened below a false floor of slatted boards. Temper- 

 ature records were taken at both the top and bottom of the bins; 

 and air movement through the ventilation flues was taken from time 

 to time. 



Air movement out of all three types of bins was found to be ap- 

 proximately the same, and controllable within rather wide limits by 

 opening and closing the air intakes or placing more or less hay in 

 the ventilation funnels. 



The following data on loss of weight was obtained. 



Studies on Bovine Mastitis 



(Pimicll Fund) 



Studies on streptococcal mastitis were continued liv L. \V. Slanetz 

 with special emphasis on the effectiveness of segregation for the 

 control of this disease. From these investigations, it is evident that 

 the detection, segregation and replacement of infected animals is 

 the best method for the prevention and eradication of streptococcal 

 mastitis. However, the utmost care in herd management and sani- 

 tation is necessary to control its spread completely when infected 

 cows are kept in the same barn as the mastitis-free animals. Once 

 a herd free from the infecti(Tus type of streptococcal mastitis is es- 

 Iriblished. it has been found possible to maintain it in this state as 

 long as no infected cows are br<»ught into the herd. 



Considerable attention was given to the classification and signifi- 

 cance of staphylococci associated with staphylococcal mastitis. The 

 characteristics of 205 strains isolated from cows in the test herds 

 and 1*^ ^irriin^; fv'in humrin v...nrc<'< were studied. One hundred 



