au 



brcadthwife, in fuch manner, that the firft tree of 

 the fecond row commences in the centre of the fquare 

 formed by the two firft tr^es of the firft row, and the 

 two firft of the third, refembling the figure of the 

 five at cards. This regular difpofition of trees was 

 formerly more regarded than at prefent, and is ftill 



much in practice in France for planting trees to form 

 a grove. 



Q.U 



Trees planted in Quincunx are fuch as are planted in 



the following form : 



« 



* 



* 



QU IN QUE FOLIUM. See Potjntilla. 



/ 



-* 



Vj 



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V- ■ 



R A 



rv 



ACEMIFEROUS fignifies bearing in 



- clufters. 



Ij 



RACEMUS, a clufter, is a ftalk divided 

 or branched into feveral foot-ftalks, fuftain- 

 ing the flowers or fruit fet together, as are the 

 bunches of Grapes, Currants, &c. The firft of thefe 

 conditions diftinguiflies it from a fpike, the laft from 



- a panicle. . ; ' > 



RADIATED FLOWERS are 



H ' 



fuch 



as 



have 



h 



\ -.^- 



feveral femiflorets fet round a difk inferni of a ra- 

 diant ftar, as are th^ flpwers of Daify, Cammoifiile, 

 &c. vThefe are called radiated difcous flowers ;thofe 

 " "which have no fuch ray, are called naked difcous 

 rrr flowers, as the Wormwood, Mugwort, Tanfey, &c. 

 RADICLE denotes that part of the feed of a plant, 



a little root, by 



^f 



s-. 



which, upon its vegetation 



which the tender plant at firft receives its nourifliment 

 -' before the after-root be formed. This is that part 

 L of the feed, which, in making malt, fhoots forth, and 

 t'^iisr called the come or comb.'-^a* 



' -■, 



-* ^ 





. ^ --r^. 





RADISH. SeeRAPHANus. 

 RADISH (HORSE.) See Cochlearia. ' 

 RAIN is generally accounted to be a crudevap'our 

 ; of the earth, but more efpecially of the fea,, drawn 

 o up from thence by the attradive power of the fun, or 



R A 



of the clouds, becaufe we do not find it rain, but 

 where clouds are to be feen, and by how much the 

 fairer the weather is, the feldomer it rains. 

 Rain is a very frequent and ufeful meteor, defcend- 

 ingfrom above in form of drops of water. 

 Rain feems to differ from dew only in this, that dew 

 falls at fome particular times, and in very fmall drops. 

 To as to be feen when it is down, but is fcarce per- 

 ceivable while it is falling ; whereas Rain is grofler, 

 and falls' at any lime. 7 — ■ ^ • 



Rain is apparenfly^' a" precipitated cloud, as clouds 



';tare nothing but vapours raifed from moifture, waters^ 

 &c. and vapours are dcnionftratively nothing elfe but 



V little bubbles, or vejfcute detached from the waters 

 by' the power of tlie folar or fubterrancous heat, 



:orb6th.' ' "^■'"'"'■'■*t*;:7'-"*:t''"":;;^:;'r*;1:'-., •' ^' ■ 



Thefe i^eficute, being Ipecifically lighter tfian the at- ' 

 ^mofphere, arc buoyed up thereby till they arnvfe^at 



a region where the air is a juft balance with them; 

 ^ and here tKey float, till by fome new agent they are 

 -'converted into clouds, and thence into either Rain, , 



1 - . : - ■.■til . 



ihow, hail, mift, or the like. 



But the agent in this formation of clouds, &c. is a 

 little controverted : the generality will have it the 

 cold, which, conftantly occupying the fuperior re- 

 gions of the air, chills and condenfes the veficulas at 

 ;.:';.w[nds into the aerial region, by which fublimation I -their arrival from a warmer quarter, congregates them • 





carried thitherward by pulfion, and wafted by the 



./i* and rarefaction, and the virtual qualities of the fun j together, and occafions feveral of them to coalefce 



5' into little maflfes; By this means their iquantity of 



♦ v 





■-L 



I - '^- - 



if .- ^ 



and air, it is formed into clouds. 



The triidities afe difpelled, ^;etnd.thcfe clouds fufpend [ '"rnStter increatihg ' m a*^ gre'atef pr^^^^ than their 



furface, they become an overload to the lighter air, 



and defcend into Rain^' 



d « 



and hang in the air; and though it may be thought 

 ^ ^* impoflible that they fhouliTbe fo fufpended in the air 

 i^;, by reafon of their great weight and preflTureV yet it 



fc. ' ' * ■ 4 ^* ^^ T ■ - ' ■ ^ij Sit- 





Kf 





-'ff*^ 



will not appear fo on confideration.; - 



' .i 1 



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^-;^- 



v*^ 



The coldnefs of the air may caufe the particles of the 

 clouds to lofe their motions, and become lefs able to 



1- 





s-** 



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■■ .'- 



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1 ^ < 



^ ' . 



When thefe vapours are thus drawn up to any confi- j refift the gravity of the incumbent air, and confeqtieht- 

 derable height by th« ftrength of the air which is un- ( ly Fo'yieldto'its preffure, arid fall to the ground. -^ 



The wind may coUefl the vapours in fuch abundance, 



grows greater and 



V 



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•^ •* 



V- 



I . 



^r'-'-- ,. 



^*-*; 



:>' 



JL 



.+ -' 



■*- 



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-.r-4 -f '.v* 



F - -■ 



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derneath them,^and which ftill 



greater, and by its motion,, undulating this way and j as firft to form very thick clouds, and then tofqueeze 



'^ ' ' ' " thofe clouds together, till the watery particles make 



i^rops too big to harig in the air. 



'- But the grand caufe, according to Monf. Rohault, 



: is ftill behind ; he conceives it to be the heat of the 



': air,^which, 'after continuing for fome time near the 



earth, is at length carried up on high by a wind, and, 



there thawins: th'e frozen villi or flocks of the half- 



that way,_ they rife gradually through the air."**---'; ' 

 . This is demonftrable by paper kites, which, after they 

 ■ are raifed to about fixty feet high, rife eafieran3 with 



greater fwiftnefs, and the higher, ftill the better and 



ftronger they fly. 



■> '^■ 



v..:>i_:^ -^^ 





--* / •\ 



Thefe vapours, being this arrived into the upper re- 

 jons of the air, are Toon aggregated and condenfed 

 into bodies and clouds. 







frozen yeficute, reduces them into drops, which, 

 ^ And though they are blown here and there, they are j coalefcing, 'defcend, and have their difiTolution per- 

 ^ -ftill fufpended, till they are releafed from their im- | fe6l:ed in their progrefs through the lower and warm- 

 ^' >prifonment by the genial difpofition of the fun, or by 

 the nsitural warmth, humidity and rarefaftioh of the 



' Ic is not ^0 be doubted, but that the Rain drops out 



.' \ --^ ----,.4, " - J^ . - , .^ . ■ -^ 



er ftages of the atfnofphere. 

 ■ » MonficurTLe Clerc and others afcribe this defcent 

 '"'of the clouds rather to an alteration of the atmo- 



" fphcre than of the veficute, and fuppofe it to proceed 



. ; ' ■ - ' - from 



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