This expression is presumed to allude to a clothes-moth cocoon happily ensconced in a cozy rug.
The phrase appears in an anonymous work in 1769 but is usually attributed to Benjamin Franklin who wrote a letter to Georgiana Shipley in 1772 commiserating her on the death of her pet squirrel named Skugg saying,
"Here Skugg lies snug
As a bug in a rug."
U.S. ebook sales up in 2012, but rate of growth is slowing(May 16 2013) In 2012, trade book sales (i.e. non academic book sales) rose 6.9%, to $15.049 billion, and e-book sales continued to grow, although the rate of growth...