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to a different degree of warmth, which, together with I ^Jf fcaly ne£!nrium to each petals which is thick and in 



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the Green-houfe, will be fufficient to maintain plants 

 from all the feveral countries of the world ; and with- 

 out having thefe feveral degrees of warmth, it will be 

 impolTible to preferve the various kinds of plants from 

 the feveral parts of Africa and America, which are 

 annually introduced into tlie Englifli gardens ; for 

 when plants from different countries are placed in the 

 fame houfe, fome are deftroyed for want of heat, while 

 others are forced and fpoiled by too much of it; and 

 this is often the cafe in many places, where there are 

 laro-e coUeftions of plants. 



In^he building thefe wings, if there are not flieds 

 runnino" behind them their whole length, the walls 

 fliould not be lefs than three bricks thick ; and if they 

 ai*e more, it will be better, becaufe whepe the walls 

 are thin, and expofcd 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 maintain a proper tem- 

 perature of warmth in the houfe. The back part of 

 thefe houfes having floping roofs, which are covered 

 either with tiles or Gates, ftiould alfo be lined with 

 Reeds, &c. 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 glafles of the' 

 flope, as alfo in front, well guarded by Ihutters, or 

 Reeds in hard froft, the. kfs fuel will, be required to 

 w^nri the houfes y fo that the_ firfl: expence in building 

 thefe houfes properly, will be the cheapeft, when the 

 afcer-expence of fires is taken into confideration. 

 . The floping glalTes of thefe houfes Ihould be made 

 to Aide and take off', fo that they may be drawn down 

 inore or lefs in warm weather, to admit air to the 

 - plants ; and the upright glafles in front may be fo con- 

 trived, as that every other may open as doors upon 

 ' i^, hinges, and the alternate glafles may be divided into 

 two ; the upper part of each ftibuld be contrived fo as 

 .. to be drawn down like faflies, fo that either of thefe 

 ,; may be ufed to admit air, in a greater or lefs propor- 

 ,, tiqn^ ^according as there may be occafion. 

 .. fiut befides the Confervatories here mentioned, it will 

 ,,. be proper to have a deep hot-bed frame, fuch as is 

 7: cohimonly ufed to raife large annuals in the fpring, 

 ^; into which may be fet pots of fuch plants, as come from 

 ..Carolina,^ Virginia, &c. while the plants are toofmall 

 '; to planup the open air, as alfo many other forts from 

 Spain, &c. which require only to be fcreened from the 

 .. yiolence of frofls, and ftiould have as much free air 

 •i as pofllble in mild weather ; which can be no tetter 

 J effefted than in one of thefe frames, where tHe glafl^es 

 ;. jnay be taken off" every day v/hen the weather will per- 

 mit, and put on every night; and in hard frofls the 

 . glaflTes may be covered wi^ mats. Straw, Peas-haulm, 

 •. or die like, To as to prevent the froft from enterino- 

 . to the pots to freeze the roots of the plants, whiqh is 

 , what will many times utterly defl:roy them',-"thougK a 

 flight froft pinching the leaves or flioots*, very feldom 

 does them much harm V if thefe pits are funk a foot or 

 more, below the furface of the ground, they will be 

 • the better, provided the ground is dry, otherwife they 

 -.-vinuftbe wholly above ground ; the fides of this frame 

 ;: Ihould be built with brick, wicH a curb of wood laid 

 ;£9.ypdon the top of tlie'wall;- into which the gutters, 

 :; on wlijch the glafl:es Aide may be laid ; the back wall 

 ; of this frame may be four feet high, and two bricks 

 :. and a half thick, the front one foot and a half; the 

 width of the infide pf the frame about fix feet, and 

 the length in proportion to the^ number of plants to 

 be contaihd therein, v ■:.-.;:;.- ■ ■:. /:t^..-.-S^ 

 GREW I A. Lin. Gen, Plant. 914. This genus of 

 plants was confliituted by Dr. Linn^us, who gave it 

 this name in honour of Dr. Grew, F. R. S. who pub- 

 lished a curious book of the anatomy of plants. 



;i. The CHARACT£|is_^re, '-.■■^iv ;'.■/■ .: .; ; ■■ ". ^^^■■ 

 The flower hath a thick leathery e?npa!ement, compofed of 

 fV-C fpear-pjaped leaves^ ^njohich are coloured^ and fpread 

 <^pn. The fiower hath five petals of the fame form^ but 

 f nailer^ (tvj arc indented at their hafey "johere is funated 



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curved, inclining to the border, to which the ftyle is fixed ; 

 it hath many ftamina, which are hriftly, the length 

 of the petals, terminated by roundifj fummits. In %e 



- cotter is fttuated the rotmdtjlj gcrmen, which is lengthened 

 to a column, fupporting a fender Jiyle, crowned by a four- 

 ccr?tered obtuje ftigvja, The germen afterward becotnes a 

 four-cornered berry with four cells, each inclofing one glo- 

 bular feed. 



This genus of plants is ranged in the fcventh feftion 

 of Linn^eus's twentieth clafs, which includes thofe 

 plants whofe flowers have many ftamina joined to the 

 fl:yle, forming a column of one body. 

 The Species are, 



1. Grewia {Occidentalis) foliis fubovatis crenatis. Grewia 

 with Gval crenated leaves, Ulmi facie arbufcula ^thi- 

 opica, ramulis alatis, floribus purpurafcentibus. Hort. 

 Amfl:. I. p. 165. tab. 85. Ethiopian Shrub with the ap- 

 pearance of Elm, winged branches, and ptirplifh flowers. 



2. Grewia {Africanus) foliis ovato-lanceolatis ferratis. 

 Grewia with oval fpcar-fhaped leaves which are fazved. 

 The firlt fort has been long preferved in many curious 

 gardens, both in England and Holland, and is fi.- 

 gured by Dr. Plukenet, by the title of Ulmifolia ar- 

 bor Africana baccifera, floribus purpureis ; but by 

 Dr. Boerhaave it was fuppofed to be one of Father 

 Plumier*s American plants, intitled Guidonia Ulmi 

 foliis, flore rofeo j but the chara6ters of this do not at 



^ all agree with thofe of the Guidonia, that particular 

 fpecies of this genus being in the royal garden at Paris, 

 which is extremely different from this. It grows na- 

 turally at the Cape of Good Hope, from whence I 

 have received the feeds, which hav.e fucceeded in the 

 Chelfea garden. -.- ^ . ■ .: > ■ • 



This will grow to the height of ten or twelve feet, 

 and has a ftem and branches very like thoft of the 

 fmall-leaved Elm, the bark being Imooth, and of the 

 fame colour as that of Elm when young ; the leaves 

 are alfo very like thofe of the Elm, and fall off in 

 winter ; the flowers are produced fingly along the 

 young branches from the wings of the leaves, which 

 are of a bright purple colour ; thefe appear toward 

 the end of July, and continue in Auguft, and the be- 

 ginning of September, but are never fucceeded by 

 fruit in this country. 

 This may be propagated from cuttings or layers ; the 



. cuttings fliould be taken off, and planted in April, 



- before the buds fwell, for they do not fucceed 

 well after;' thefe cuttings ihould be planted in 

 fmall pots filled with loamy earth, and the pots ffibuld 



\r be plunged into a rrioderate hot-'bed of tanners baric, 



./where, if they are duly watered, and in the heat of 



' the day fhaded from the fun, they will take good root 



i' in about two months, and may then be gradually in- 



\ ured to bear the open air, into which they fliould . be 



-! removed in June, and placed in a flickered fituation, 



/where they may remain till autumn, when they m'uft 



be removed into the green-houfe ; the beft time to lay 



down the layers of this plant is in the fpring, before 



the buds come out, and thefe will be rooted by the 



fame time the following year, when they may be cut 



. off from the old plants, and planted each into a fe- 





parate pot filled with a foft loamy foil, 

 t The befl: time to rernove or tranfplant this plant Is, 

 : either in the fpring, jufl: before the buds begin to 

 : fwell, or in autumn, when the leaves begin to drop; 

 for in fummer, when the plants are in full leaf, it will 

 be very improper to difl:urb them. --n: r v. :,:\: . *'. 

 In winter thefe plants fliould be placed in the green- 

 houfe, for they are too tender to live abroad in Eng- 

 . land ; but they ftiould have as much free air as poflible 

 in mild weather, for they only require to be proteded 

 from froft, and after their leaves are fallen, they will 

 require very moderate watering ; but in fummer they 

 fliould be confl:antly watered three or four times a week 

 in dry weather, and placed in a flieltcred fituation, 

 with other hardy green-houfe plants, where they will 

 add to the variety. .:•-:. 

 The feeds of the fecond fort were fent me by Monf. 



Richard, gardener to the King of France at Mar- 



fcillc3. 



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