492 TIMBER nONDS 



man of a yarding crew to the engineer of a yarding 

 donkey. 



Silvics. 1. The science which treats of the life of 

 trees in the forest. 2. The habit of behavior of a 

 tree in the forest. 



Silviculture. The art of producing and tending a for- 

 est; the application of the knowledge of silvics in 

 the treatment of a forest. 



Single Tree Method. That method of conservative lum- 

 bering in which reproduction from self-sown seed 

 under the shelter of the old stand is invited by the 

 cutting of single trees. This cutting may be made 

 throughout the forest, as in some woodlots, or in defi- 

 nite portions of the forest in turn. 



Single Out. To float logs, usually cypress, one at a time, 

 from the woods to the float road. 



Sinker. See Deadhead. 



Sinker Boat. See Catamaran. 



Skid. 1. To draw logs from the stump to the skidway, 

 landing, or mill. 2. As applied to a road, to re- 

 enforce by placing rods or poles across it. 3. A log 

 or pole, commonly used in pairs, upon which logs are 

 handled or piled , or the log or pole laid transversely 

 in a skid road. 



Skidder. 1. One who skides logs. 2. A steam engine, 

 usually operating from a railroad track, which skids 

 logs by means of a cable. 3. The foreman of a crew 

 which constructs skid roads. 



Skidding Chain. A heavy chain used in skidding logs. 



Skidding Hooks. See Skidding tongs. 



Skidding Sled. See Dray. 



Skidding Tongs. A pair of hooks attached by links to 

 a ring and used for skidding logs. 



Skidding Trail. See Gutter Road. 



Skid Grease. A heavy oil applied to skids to lessen the 

 friction of logs dragged over them. 



Skid Road. 1. A road or trail leading from the stump 

 to the skidway or landing. 2. A road over which 

 logs are dragged, having heavy transverse skids par- 

 tially sunk in the ground, usually at intervals of about 

 five feet. 



Skid Up. 1. To level or re-enforce a logging road by 

 the use of skids. 2. To collect logs and pile them 

 on a skidway. 



Skidway. Two skids laid parallel at right angles to a 

 road, usually raised above the ground at the end 

 nearest the road. Logs are usually piled upon a skid- 



