200
word phrases or passwords
____________were used to determine slaves.
example:
"The wind blows from the south today" - the warning of slave bounty hunters nearby
"A friend with friends" - used to signal the arrival of fugitives with an Underground Railroad conductor
"The friend of a friend sent me" - used by fugitives traveling alone to indicate they were sent by the Underground Railroad network
Load of potatoes, parcel, or bundles of wood - fugitives to be expected