ON WOOD AND PLANTATIONS. 
115 
in small leading groups, and then by effecting a union be- 
tween the groups of different character, by intermingling 
those of the nearest similarity into and near the groups : in 
this way, by easy transitions from the drooping to the round- 
headed, and from these to the tapering trees, the whole of 
the foliage and forms, harmonize well. 
[Fig. 31. Example in grouping.] 
11 Trees,” observes Mr. Whately, in his elegant treatise on 
this subject, u which differ in but one of these circumstances, 
of shape, green, or growth, though they agree in every other, 
are sufficiently distinguished for the purpose of variety : if 
they differ in two or three, they become contrasts : if in all, 
they are opposite, and seldom group vrell together. Those, 
on the contrary, which are of one character, and are distin- 
guished only as the characteristic mark is strongly or faintly 
impressed upon them, form a beautiful mass, and unity is 
preserved without sameness.”* 
There is another circumstance connected with the colour 
of trees, that will doubtless suggest itself to the improver of 
taste, the knowledge of which may sometimes be turned to 
valuable account. We mean the effects produced in the ap- 
parent colouring of a landscape by distance, which painters 
term aerial 'perspective. Standing at a certain position in a 
* Observations on Modem Gardening. 
