We know how well that screening worked out, now don't we?
He also carried out some new experiments on the effects of heat, and of screening by magnetic substances, and investigated the influence of shape upon the magnetization of iron.
Basically these antigens are acting as a screening agent.
At a later period, however, the difficulty of screening the rites of baptism and Eucharist from the eyes of catechumens and from their ears the creeds and liturgies - a difficulty which had ever been formidable and which after the overthrow of paganism must have become insurmountable - seems to have provoked not only a great outpouring on the part of the Christian rhetors, like Basil, Chrysostom, the Gregories and the Cyrils, of phrases borrowed from the Greek mysteries, but perhaps an actual use of precautions.
These raids, and the more ordinary screening work, were never executed more brilliantly than by Lee's great cavalry general, "Jeb" Stuart, in Virginia, but the Federal generals, Pleasonton and Sheridan, did excellent work in the east, as also Wheeler and Forrest on the Confederate, Wilson and Grierson on the Federal, side in the west.