Which among the following is not a work of Samuel Johnson?

The correct option is The Journal of Stella.

To understand why this is the correct answer, let us look at the authorship of each work listed in the options:
1. The Rambler: This is a series of periodical essays published twice weekly from 1750 to 1752, written almost entirely by Samuel Johnson.
2. The Idler: This is another series of essays written by Samuel Johnson, published weekly between 1758 and 1760 in the periodical The Universal Chronicle.
3. The Perpetual Effects of Reverie: This is a well-known essay (specifically, The Idler No. 32) authored by Samuel Johnson that discusses the human tendency to daydream.
4. The Journal of Stella (more commonly titled Journal to Stella): This is a series of intimate letters written by Jonathan Swift to Esther Johnson (whom he nicknamed Stella) between 1710 and 1713. Swift, not Samuel Johnson, is the author of this work. Therefore, it is the only work in the list not written by Samuel Johnson.