Word: filtered
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...greatly inflamed and cause painful ulcers. His face is the shrunken visage of an old man. The nurses at the Charity Hospital call him " Grandpop." The disease is fatal unless the sun can be kept away from the skin. A New York electrical engineer devised a protective armor to filter the sun's rays so that only those milder than the red of the spectrum can reach the lad's body...
Practically all efforts to attack paresis hitherto have been frustrated because antisyphilitic drugs, usually mercury or arsenic compounds, cannot pass through the choroid plexus, a sort of fine filter at the base of the brain. The germs which reach the higher centers are free to develop and soon do permanent damage to the brain tissue...
...Juniors have been known to take pride in the fact that they had never seen the inside of Appleton, just as their forefathers must sometimes have boasted of a non-cut record for old Holden--each, it would seem, with about as much understanding of values. But gradually they filter in; and typical morning-service congregations have more Seniors than under-classmen, not because Seniors are more serious-minded, but because they have found those fifteen minutes an agreeable manner of opening the day. The reaction is not necessarily religious; its only effect may be to turn the mind...
When the battle is hottest and the wounded begin to filter back through the lines, some of them--hit by a shell or shot through an arm or shoulder--are able to stumble back alone toward the dressing stations between the lines...
This reciprocal influence we often lack at Harvard. Men in higher courses are likely to receive it, but it does not filter down to the ordinary undergraduate. The advisor system has usually failed to provide it. Other colleges have tried the plan of holding departmental smokers where the teachers can talk informally with their students and where the flow of ideas is unrestricted. This, of course, offers only an opening, which he must follow...