Emily Dickinson help needed!!!?

Question:

Emily Dickinson help needed!!!?

I have a project for English class and I need some help figuring out the tone of the following poem. Also, I need some possible meanings of the last two lines of the poem. I undestand that it deals with change.

As imperceptibly as Grief
The Summer lapsed away—
Too imperceptible at last
To seem like Perfidy—
A Quietness distilled
As Twilight long begun,
Or Nature spending with herself
Sequestered Afternoon—
The Dusk drew earlier in—
The Morning foreign shone—
A courteous, yet harrowing Grace,
As Guest, that would be gone—
And thus, without a Wing
Or service of a Keel
Our Summer made her light escape
Into the Beautiful.

Best Answer - Chosen by Asker:

I have a tip that can help u. Go to dictionary dot com and look up the words u dont get in the poem so it can help u understand it !!!!!!!!!!good luck have a nice day!