Hotbed

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1. a bed of soil enclosed by a structure with a top of glass, heated, often by manure, for forcing (force) or raising seedlings.

A-HotBed-361.jpg

Diagram of a hotbed.
Source: http://chestofbooks.com/home-improvement/woodworking/Carpentry-and-Mechanics-For-Boys/Chapter-XXVIII-A-HotBed.html