HOTHOUSE BUILDING. 205 



cases. What painters term general effect, is 

 required, breadth of light and shade, connection 

 of parts, grouping, according to the diversity of 

 the scenery. Many think when they have en- 

 gaged a first-rate gardener he can do anything 

 in laying out or improving, but improvements 

 and alterations are two different things ; the 

 knowledge required for a good horticultural 

 gardener to possess, is very different to the 

 taste and judgment requisite for the disposition 

 of woody scenery, and of a fundamental know- 

 ledge of arboriculture, which none but those who 

 have a thorough knowledge of the nursery bu- 

 siness can possess ; for without such knowledge 

 he cannot possibly be a sufficient judge of the 

 nature and constitution of trees generally, to 

 know which will and which will not suit the dif- 

 ferent soils and situations. This is one principal 

 cause why so many failures take place, and 

 what is still worse, the disappointment which 

 ensues. 



It has been said, by some writers on this 

 subject, who profess landscape gardening, that 

 it is a good test of a man's science in every 



