How to use "mid" in a sentence

The story was set in the mid-nineteenth century, when a physician's perception of the thin line between life and death was often cloudy

Furthermore, this was not the mid-nineteenth century; these days, doctors could detect even the vaguest heartbeat, the shallowest respiration, the dimmest traces of brain-wave activity.

Here was a four-masted barkentine with sails taut in a perpetual wind; and here was a mid-sixteenth-century Swedish kravel