G R 



G R 



thick ; and if they are more, it will 

 be better ; becaufe, where theWalls 

 are thin, and expofed to the open 

 -Air, the Cold will penetrate them ; 

 and when the Fires are made, the 

 Heat will come out through the 

 Walls ; fo that it will require a 

 larger Quantity of Fuel, to main- 

 tain a proper Temperature of 

 Warmth in the Houfe. The Back- 

 part of thefe Houfes, having floping 

 Roofs, which are covered either 

 with Tiles or Slates, mould alfo be 

 lined with Reeds, ifc. under the 

 Covering, as is before directed for 

 the Green-houfe ; which will keep 

 out the cold Air, and fave a great 

 Expence of Fuel ; for the clofer and 

 better thefe Houfes are built, and 

 the GlafTes of the Slope, as alfo in 

 Front, well guarded by Shutters or 

 Reeds in hard Froft, the lefs Fuel 

 will be required to warm the Houfes ; 

 fo that the firfl Expence in building 

 thefe Houfes properly, will be the 

 cheapeft, when the after Expence of 

 fires is taken into Confideration. 



The floping GlalTes of thefe 

 Houfes mould be made to Hide, and 

 takeoff; fo that they may be drawn 

 down more or lefs, in warm Wea- 

 ther, to admit Air to the Plants ; 

 and the upright GlsiTes in Front 

 may be fo contrived, as that every 

 other may open as Doors upon 

 Hinges; and the alternate GlafTes 

 may be divided into two : the Up- 

 per-part of each mould be contrived 

 To as to be drawn down like Safhes ; 

 fo that either of thefe may be ufed 

 to admit Air, in a greater or lefs 

 Quantity, according as there may be 

 Occafion. 



: But, befides the Confervatories 

 here mentioned, it will be proper to 

 have a deep Hot-bed-frame, fuch as 

 is commonly ufed to raife large An- 

 nuals in the Spring; into which may 

 l)e let Pots of fuch Plants as come 



from Carclina, Virginia, &c. while 

 the Plants are too fmall to plant in 

 the open Air ; as alfo many other 

 Sorts from Spain, &c. which require 

 only to be fcreened from the Vio- 

 lence of Frofts, and mould have as 

 much free Air as pofiible in mild 

 Weather ; which can be no better 

 effected than in one of thefe Frames, 

 where the Glalles may be taken off 

 every Day when the Weather will 

 permit, and put on every Night ; 

 and in hard Frofts the GlaiTes may 

 be covered with Mats, Straw, Peas- 

 haulm, or the like, fo as to prevent 

 the Froft from entering the Pots to 

 freeze the Roots of the Plants, which 

 is what will, many times, utterly 

 deftroy them ; though a flight Froft 

 pinching the Leaves or Shoots very 

 feldom does them much Harm : if 

 thefe are funk a P'oot or more below 

 the Surface of the Ground, they will 

 be the better, provided the Ground 

 is dry ; otherwife they mult be 

 wholly above-ground : the Sides of 

 this Frame Ihould be built with Brick, 

 with a Curb of Wood laid round on 

 the Top of the Wall, into which the 

 Gutters; on which the Glaffes Aide, 

 may be laid : the back Wall of this 

 Frame may be four Feet high, and 

 the Front one Foot and an half ; 

 the Width about fix Feet, and the 

 Length in proportion to the Num- 

 ber of Plants. 

 GREWIA. 



This Genus of Plants was con- 

 fliruteti by Dr. Linna-us, who gave it 

 this Name, in Honour to Dr. Greiv 9 

 F. R. S. who publifhed a curious 

 Book of the Anatomy of Plants. 

 The Characters are ; 



The Empalement of the Flower is 

 compofed of fi<ve thick fpear-Jhaped 

 &e&*ves t ix hi ch are coloured within: 

 thr Flower has fi<ve Leases of the fame 

 Shape with thofe of the Empalement ; 

 but ere f mailer ; in tkg Centre of the 



Flevjer 



