Yes, dry mustard can safely be used as a substitute for mustard seed. However, it may make the brine cloudier than mustard seed and may alter the flavor.   1 teaspoon mustard seeds = 1Â½ teaspoons dry mustard.
Humeston is a city in Wayne County, Iowa, United States. The population was 494 in the 2010 census, a decline from 542 in the 2000 census.
As of the census of 2000, there were 706 people, 284 households, and 191 families residing in the town. The population density was 1,800.0 inhabitants per square mile (695.0/km2). There were 316 housing units at an average density of 805.7 per square mile (311.1/km2).