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.
2010 census [edit]. As of the census of 2010, there were 508 people, 223 households, and 131 families residing in the town. The population density was 958.5 inhabitants per square mile (370.1/km 2).