Bottom bed

(Geol.) A name sometimes given to some partially, or doubtfully, fo iliferous strata which immediately underlie the Silurian system in Wales. Bot'tom Captain, n. ( Mining.) A superintendent over the miners in the bottoms. Bottom-glade, n. A valley or dale; a low, open glade. "The hilly crofts That brow this bottom glade." - Milton. Bot'tom-gra , n. Gra growing on bottom-lands. Bottom-heat, n. ( Gardening .) A term applied in horticulture to the temperature communicated to certain soils, either by fermenting or decomposing substances placed underneath them, for which purpose leaves, fresh dung, and the refuse bark of the tan-yard are often used; or by means of flues or hot-water apparatus. The system is applied to the cultivation of pine-apples, grapes, cucumbers, and other plants grown in hot-houses, pits or frames. It is one of the most important agents in the artificial cultivation of tender plants, of whatever kind, whether flower-bearing or fruit-bearing.