388 



STATE BOARD OF AGRICULTURE. 



of milk were returned to the farmers because they were sour on arrival 

 at the plant. 



CLASSES AND PRIZES AWARDED. 



Prizes were awarded under Class A to patrons delivering milk having 

 the highest average pH scores during the contest as follows : 



Class A. 



1st prize 

 2nd prize 

 3rd prize 

 ttth prize 

 5th prize 



Patron 30 

 Patron 20 

 Patron 72 

 Patron 102 

 Patron 20 



Average pH score 91 

 Average pH score 88 

 Average pH score 88 

 Average pH score 87 

 Average pH score 85 



Prizes were awarded for the greatest improvement under Class B as 

 follows : 



Class B. 



1st prize Patron 14 



2nd prize Patron 38 



3rd prize Patron 12 



4th prize Patron 46 



5th i^rize Patron 18 



Improvement in pH score 34 

 Improvement in pH score 19 

 Improvement in pH score 17 

 Improvement in pH score 15 

 Improvement in pH score 12 



No patron was awarded a prize in both Class A and Class B. 



RESULTS OF THE BACTERIOLOGICAL COUNT 



To determine the effect of tlie contest upon the bacteriological count 

 a one cubic centimeter portion of milk was taken from a representative 

 sample of each patron's milk and the whole mixed and plated. The result 

 is compared with the average pH score each day of the test in Table III. 



The bacteriological counts of composite samples of milk made each Aaj 

 of the preliminary period and contest proper indicate a still greater im- 

 provement in the milk supply than does the pH score. The average count 

 during the preliminary period was 3,800,000 bacteria per cubic centimeter 

 as compared with an average count of 920,000 during the contest proper. 



RESULTS OF THE WEINZIRL SPORE TEST. 



In order to obtain data upon the value of the anaerobic spore test for 

 manurial pollution a weekly test was made of milk from each patron ac- 

 cording to the method described by iWeinzirl (3). The results of these 

 tests are tabulated in Table IV. The samples marked + had typical 

 stormy fermentations in at least two tubes at the end of three days 

 incubation which is to be considered as positive for manurial pollution. 

 The remaining samples had not more than one tube out of five showing 

 the typical stormy fermentation and indicate negative manurial pollution. 



RELATION BETWEEN pH SCORE AND MANUAL POLLUTION. 



That there is some connection between the average pH score and the 

 average manurial pollution is indicated by the following facts. 



Preliminary period. Of the seven milks showing tbe least manurial 

 pollution all but two were in very good condition with an average pH 



