160 A MANUAL OF FORESTRY. 



b. The Strip System. 



The system partakes of the character of the com- 

 partment system carried out on small compartments ; 

 the danger of failure over a large continuous area is 

 avoided, and the shelter- wood less liable to be blown 

 down, but the operations are less concentrated. 



c. The Group System. 



(1.) The drawbacks are, that the operations are 

 scattered over a larger area at one and the same time, 

 rendering supervision more difficult and the transport of 

 the material more expensive. 



(2.) The principal advantages of this system over the 

 compartment system are : 



(.) It insures a more complete preservation of the 

 factors of the soil ; 



(#.) It affords greater security as regards the suc- 

 cess of the regeneration, because it is carried 

 out on small scattered areas, so that failure 

 in one does not imply failure in the others ; 



(c.) Each group can be taken in hand when the 

 most favourable moment for regeneration has 

 arrived. 



(3.) In summing up, it may be said that the group 

 system is in its place where the conditions of the locality 

 or of the crop change from place to place, or where 

 extremes of climate prevail. It is admirably adapted 

 for the regeneration of mixed woods, as it affords excel- 

 lent opportunities for securing a proper mixture of the 

 several species in the new crop. 



