Read it through once

It was Dairyman Crick’s rule to insist on breaking down these partialities and aversions by constant interchange, since otherwise, in the event of a milkman or maid going away from the dairy, he was placed in a difficulty. The maids’ private aims, however, were the reverse of the dairyman’s rule, the daily selection by each damsel of the eight or ten cows to which she had grown accustomed rendering the operation on their willing udders surprisingly easy and effortless.