78 LANDSCAPE GARDENING. 



even where a very few trees are used, of which any 

 person may convince himself by placing a few dots on 

 paper. Thus two trees (fig. 15), or a tree and shrub, 

 which is the smallest group (a), may be placed in three 

 different positions with reference to a spectator in a fixed 

 point ; if he moves round them, they will first vary in form 

 separately, and next unite in one or two groups, according 

 to the position of the spectator. In like manner, three 

 trees may be placed in four different positions ; four trees 

 may be placed in eight different positions (b) ; five trees 

 may be grouped in ten different ways, as to ground plan ; 

 six may be placed in twelve different ways (c), and so on." 

 Encyclopaedia of Gard.) 



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[Fig. 15. Grouping of Trees.] 



In the composition of larger masses, similar rules must 



