The samples of milk from some farms always showed gas, whilst 

 from others it was only occasionally present, and a few samples never 

 showed a trace. On the hottest days the number of gas-producing bac- 

 teria was often very large, whilst on cooler days the number present was 

 always very small. 



From a number of samples of milk obtained from other sources, we 

 isolated gas-producinp- bacteria, but these samples were not so fresh as 

 those we collected at the Dairy. The following table shows the results of 

 the examination of milk from the College Dairy herd and from the mixed 

 milk of farmers supplying the factory. A perusal of this table shows that 

 for the 27 examinations here recorded the percentage of gas-producin^^v 

 bacteria varied from a fraction of one per cent, to over 34 per cent., with 

 an average of 4.67. This tal:l.-' by no means represents the total number 

 of examinations madv\ as in nearly every case each farmer's milk was ex- 

 amined from three to seven times. 



[2] 



