PIP 



461 



PIT 



Table of the quantity of pipe, four inches diameter, which will heat one 

 thousand cubic feet of air per minute, any required number of degrees- the 

 temperature of the pipe being 200" Falirenheit. 



To ascertain by the above Table the quantity of pipe which will heat one 

 thousand cubic feet of air per minute: — find, in the first column, the tempera- 

 ture corresponding to that of the external air, and in one of the other columns 

 find the temperature of the room; then in this latter column, and on the line 

 which corresponds with the external temperature, the required number of feet 

 of pipe will be found. See Hot water and Steam. 



PIPE-WORT. Eriocaulon. 



P1PL\G. See Pink and Carnation 

 for this mode of propagation. 



PIPTANTHU8 nepalensis. Hardy 

 deciduous shrub. Layers and cuttings. 

 Rich loam. 



PIPTOCLAINA supina. Hardy an- 

 nual. Seed. Common soil. 



PIQUERIA trinervia. Hardy herb- 

 aceous. Division. Light rich loam. 



PISCIDIA. Jamaica Dogwood. 

 Two species. Stove evergreen trees. 

 Cuttings. Light loam. 



PISCINARY is another name for a 

 fish pond, which in landscape garden- 

 ing comes under the general terms 

 Water and Pond, which see. ■ 



PI ST A CHI A. Four species and 

 more varieties. Hardy and half-hardy 

 evergreen and deciduous trees. Lay- 



ers and ripe cuttings ; light rich loam. 

 Even the hardy species of this genus 

 do best against a wall. 



P I S T O R I N I A hispanica. Hardy 

 biennial. Seed. Light well-drained soil. 



PISUM. Pea. Seven species and 

 many varieties. Hardy annual climbers, 

 except the herbaceous perennials, P. 

 americanum and P. maritimum. Seed. 

 Rich dry soil. See Pea. 



PIT, in the Conservatory, is the body 

 of soil in which the shrubs, &c., are 

 planted ; in the Stove, it is the excava- 

 tion in which is the tan, or other mate- 

 rial for plunging the pots; and for 

 Forcing, it is a structure having a glass 

 roof, and dift'ering from a forcing frame 

 only in being larger, and with sides 

 fixed to the soil. Pits for this purpose 

 were usually sunk in the ground; but 



