Toxic waste that spoils the water supply is an example of contamination.
(2) There is a great increase in contamination in the milk at each stage before it reaches the customer.
This provides for the reduction as far as possible of contamination during the milking process itself.
If the contamination exceed a certain limit, the scrapings remain quite dead.
The unavoidable contamination with muddy particles of vat-waste is removed by allowing the vatliquor to rest for some hours in a separate tank and settling out the mud.
He would pollinate a wheat stalk, then cover it with a trash bag to prevent contamination by other plants.