DAIRY FACTORY PREMISES. 



31 



Agar Plate of air exposure for 2& minutes in the cold room 

 at chilling temperature. 



Note the slight infection by moulds, &c. 



(Original.) 



C7 



Agar Plate of air exposure for 2- : minutes in the churn room. 



. Note the purity of the air, the locality being an elevated one. (Original.) 



