Authors:

The too perfect security of the Upper-worlders had led them to a slow movement of degeneration, a general dwindling in size, strength, and intelligence.

H. G. Wells (2016). “H. G. Wells The Dover Reader”, p.41, Courier Dover Publications
The too perfect security of the Upper-worlders had led them to a slow movement of degeneration, a general dwindling in size, strength, and intelligence.