SAMPLE PLOTS IN Tlllv ADIKO.XDACKS 923 



Corners and Boundaries. — All corners'' should be either of very dura- 

 ble wood or of some semi-durable species which has been seasoned for 

 some time or creosoted. 



PLAN' FOR PERMANKNT SAMPLE PLOTS 



in marking corners the letter "S" should be scribed thereon, so as to 

 indicate a silvicultural area. Corners should be witnessed where prac- 

 ticable and tied to some known point by a traverse. Kach co-operator 

 should number his plots serially. The marking of S-2 indicates corner 

 of sample plot number 2. 



All plot corners should be substantial, and set 2 feet in the ground 

 where possible and 3 feet above the surface ; the smaller stakes should 

 be driven in until firm. The corner posts should be painted if i)rac- 

 ticable. 



Measttreinents 



Diameter. — .Ml merchantable species having an average diameter at 

 breast height, outside the bark, of an even 4.0 inches or over should be 

 measured and numbered. Stumps from cuttings within a definitely 

 known year may be measured, recorded, and located if desired. 



All diameter measurements should be recorded to the nearest tenth 

 of an inch, the measurement being taken 4.5 feet from the ground ; this 

 point to be secured by measurement, using an average for trees on slop- 

 ing ground. Where a measurement cannot be taken at breast height, 

 it should be taken at the nearest practical point above and below 

 breast height and an average obtained ; where a fork occurs below breast 

 height, each fork should be numbered and recorded separately ; where 

 the fork is too high for this, the main stem of the tree should be meas- 

 ured below and where the swelling (from the fork) is not appreciable. 

 Care must be taken that swellings or small limbs are not included in 

 the measured diameter. Notes should be made of any irregularities in 

 the form of the tree which visibly aftect the figures obtained, such as 

 large burns, deep scars, swellings, etc. A self-winding diameter tape 

 is advised.'' If cali])ers are used, they should always be held at right 

 angles to the bole of the tree and readings should be made in two direc- 

 tions. The first diameter reading should be taken directly at the center 

 of the ])ainted cross, so that the tree's diameter (at that point) divided 

 by two will appear directly at the cross — that is, for a reading of 20 



"Where the danger from fire is Rreat llie plot coriu-rs should he siirroniKkd I)y 

 \:ir^v nioiiiids of earth or rock or hoth. 

 * I.iifkin Kule Co., .Saginaw, Mich. 



