So from now on, you're going to have an infiltration of cloak and dagger lads from every outfit with an interest in North Africa.
"Border, Breed Nor Birth"
Dallas McCord Reynolds
The infiltration of English words and phrases into the languages of the province is a useful process and as inevitable as was the enrichment of the old English speech by Norman-French.
"The Panjab, North-West Frontier Province, and Kashmir"
Sir James McCrone Douie
Whatever might seem to suggest the contrary, would be explainable by some infiltration of more civilized beliefs.
"The Faith of the Millions (2nd series)"
George Tyrrell