...This stock was variedcontinually; now by new infiltration of Negro blood from the south,now by Negroid and Semitic blood from the east, now by Berbertypes from the north and west... 
W.E.B. Du Bois 「The Negro」
...The people of Bornu had a large infiltration of Berber blood, butwere predominantly Negro...
W.E.B. Du Bois 「The Negro」
...The disaster was due to the gradual infiltration of water from the Nile beneath the structure, whose foundations, as is usual in Egypt, were of the flimsiest description...
L.W. King and H.R. Hall 「History Of Egypt, Chaldæa, Syria, Babylonia, And Assyria In The Light Of Recent Discovery」
...The wall was slowly and sluggishlyadvancing, and a fresh infiltration was drifting in on another side...
Various 「Astounding Stories of Super-Science, November, 1930」
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