PLANTING IN EXPOSED SITUATIONS. 13 



be the last removed. And for the purpose of giving 

 depth and massiness to some of the larger groups, a 

 part of the common trees may be left as a back-ground 

 to the more valuable specimens. And such an arrange- 

 ment could be provided for to a greater extent by 

 keeping it in view when planting. 



It will frequently be found highly advantageous to 

 include what are ultimately to be detached groups and 

 single trees into one common plantation when young. 

 A greater amount of shelter will be afforded, and each 

 tree, while it assists to protect the other, will par- 

 ticipate in the general benefit. And when the whole 

 of the shelter is ultimately removed, the permanent 

 trees will appear in their intended positions and 

 relations. 



The great change of climate which plants experience 

 when removed from the nursery to open and exposed 

 situations, is a principal cause of their frequent failure 

 there. The comparatively dry state of the atmosphere 

 in the latter is not the least prominent source of 

 injury. Wherever vegetation is scanty, there will 

 the atmosphere be deficient in moisture, a subject of 

 great importance when considered in relation to the 

 progress of young trees. And as vegetation not only 

 participates in the benefits, but materially augments 

 the atmospheric moisture, of a district, it follows that, 

 by employing other trees as shelter to those we are 

 most solicitous about, we combine several essentials to 

 success, viz., breaking the force of winds, affording a 

 genial shelter, and condensing and retaining a large 

 amount of moisture. 



