One at least to each bed. Two beds and two windows on each side of the
four-bed ward.
In a single-bed ward the bed should not be placed directly between
window and door. And it must never be in an angle. There must be room
for attendants on both sides the bed.
This is still more essential in a delivery ward. Each bed should be
lighted on _both_ sides by windows, and should have at least five feet
of passage room on either side.