A Kind of Sea-Turn In Harmony With The Other

From the Journals of Henry David Thoreau:

May 31, 1858/
There was a slight sea-turn, the wind coming cool and easterly this morning, which at first I mistook for the newly leafing deciduous trees investing the evergreens, which is kind of a sea-turn in harmony with the other. I remember that the stage drivers riding daily from Concord to Boston and becoming weatherwise perforce, often meeting the seabreeze on its way to the country, were wont to show their weather wisdom by telling anxious travellers that it was nothing but a sea-turn.