Police manned virtually every street corner in a ten-square-block area in downtown Washington by 3 p.m. yesterday. Standing police ringed three of the nine Mayday targets throughout the afternoon and night.

Those demonstrators arrested yesterday-numbering 250 in all-will probably not be out of jail until tonight. Police Chief Wilson denied collateral Wednesday for demonstrators for the duration of the week, and sources indicated yesterday that bail collateral will be raised to 20 per cent or about $50. The Washington Superior Court did not refuse to hear cases yesterday.

Hosea Williams, deputy program director of the Southern Christian Leadership Conference, said Saturday that bail funds are almost nonexistent and would depend almost entirely on contributions collected yesterday and Saturday at the park.

In excess of 1300 people have been arrested since April 21 in connection with antiwar demonstrations.

Police are working 12-hour shifts and the entire 5100-man force is on duty. Many are working overtime, remaining on duty for as long as 22 hours. At yesterday's sweep of the park, several policemen were visibly irritated by the long wait before moving in.

Nor were they pleased as they marched past the smoldering campfires and abandoned tents of what was once Algonquin Peace City. What they found was an indication that there are many more hours of unenviable duty in store for them in the next three days. As one message left on an abandoned tent post in Peace City told them: "Sorry we couldn't oblige you, but we don't dig violence. See you tomorrow. Peace."